A conference room with table and chairs. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3337630/free-photo-image-boardroom-conference-office-backgroundFree Image from public domain licenseGlass panels in the modern facade of a building in Madrid. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3282205/free-photo-image-office-building-background-clean-minimalistFree Image from public domain licenseThe top edge of a gray building facade. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286734/free-photo-image-minimal-architecture-modernFree Image from public domain licenseWhite apartment building. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286554/free-photo-image-abstract-white-curveFree Image from public domain licenseWhite abstract geometric artwork from Dresden, Germany. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283970/free-photo-image-pattern-artwork-abstractFree Image from public domain licenseDrawing of the Smith Premier typewriter (1910) vintage illustration. Original public domain image from Wikimedia Commons.… https://www.rawpixel.com/image/11493455/image-art-illustrations-vintageFree Image from public domain licenseFog covers the top of a tall building with rectangular glass design facade in Madrid.. Original public domain image from… https://www.rawpixel.com/image/3285504/free-photo-image-madrid-architectural-architectureFree Image from public domain licenseNothing in the books says a windmill has to look like a windmill -- but that it must have a set of blades, something to kick… https://www.rawpixel.com/image/3322419/free-photo-image-poster-building-architectureFree Image from public domain licenseFree white music speakers image, public domain design CC0 photo. https://www.rawpixel.com/image/5926312/photo-image-background-public-domain-minimalistFree Image from public domain licenseConversion. Auto body plant. This worker is cleaning wing parts with solvent, a necessary process prior to painting.… https://www.rawpixel.com/image/12240167/photo-image-face-plant-personFree Image from public domain licenseGeometric corner of a building in Madrid, Spain. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297403/free-photo-image-madrid-architecture-buildingFree Image from public domain licenseModern architecture in Madrid, Spain. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3290516/free-photo-image-hospital-building-apartment-archFree Image from public domain licenseModern building in fog, Madrid, Spain. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3303341/free-photo-image-madrid-apartment-building-architectureFree Image from public domain licenseA modern geometric building design in Madrid.. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297279/free-photo-image-achitecture-architecture-arenaFree Image from public domain licenseThree window cleaners on ropes on an office building facade. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297787/free-photo-image-architecture-and-person-cleaner-window-washerFree Image from public domain licenseThe yellow facade of a building in Qingpu under a blue sky. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297604/free-photo-image-public-domain-abstract-architecture-blue-yellowFree Image from public domain licenseBlack & White Shapes of the ArtScience Museum. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297680/free-photo-image-architecture-artscience-museum-blackandwhiteFree Image from public domain licenseA dotted pattern on a white curved facade. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3295262/free-photo-image-alphabet-architecture-buildingFree Image from public domain licenseCasa da Música, Porto, Portugal. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3300159/free-photo-image-porto-architecture-automobileFree Image from public domain licenseConversion. Beverage containers to aviation oxygen cylinders. Removing of non-shatter-chemical solution tank at a rubber… https://www.rawpixel.com/image/12239731/photo-image-hand-person-factoryFree Image from public domain licenseBantam, Connecticut. Defense homes. Little Ann Heath is eager to try out all the facilities of her parents' new four-room… https://www.rawpixel.com/image/12239729/photo-image-face-person-womanFree Image from public domain licenseThe cylindrical stairwell at a building in Cuyahoga Falls. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297038/free-photo-image-architecture-banister-beaconFree Image from public domain licenseTwo people under a cylindrical glass skyway connecting two buildings. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3302295/free-photo-image-glass-building-architecture-banisterFree Image from public domain licenseProduction. Willow Run bomber plant. An African American worker at the giant Willow Run bomber plant installs screws in one… https://www.rawpixel.com/image/12239801/photo-image-face-plant-handFree Image from public domain licenseHigh school Victory Corps. James Parsley and Bill Sabin do their clean-up chores for the day in Montgomery Blair High… https://www.rawpixel.com/image/12239992/photo-image-person-man-tableFree Image from public domain license170203-N-YL073-189 (Feb. 3, 2017) PUERTO BARRIOS, Guatemala - Hospitalman Billy Gibson, a native of Barnsville, Ga.… https://www.rawpixel.com/image/8739537/photo-image-public-domain-doctor-personFree Image from public domain licenseProduction. Tin smelting. "Bars" of pure tin are trimmed and cleaned before removal from the molds in which they were formed… https://www.rawpixel.com/image/12302234/image-plant-person-factoryFree Image from public domain licenseWoman power in India. Indian cleaning and oiling spare parts for tanks supplied under lend-lease. Sourced from the Library… https://www.rawpixel.com/image/12303798/image-person-art-horseFree Image from public domain licenseThere'll be a long wait for new stoves, so take care of the one you own. Whether it operates by gas or electricity, coal or… https://www.rawpixel.com/image/12303598/image-hand-person-phoneFree Image from public domain licenseProduction. Magnesium. A worker's wife waters the newly planted lawn around one of the 1,000 demountable houses built in the… https://www.rawpixel.com/image/12302578/image-plant-person-skyFree Image from public domain licenseConversion. Copper and brass processing. 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Phase 4 of… https://www.rawpixel.com/image/11071644/photo-image-person-instagram-facebookFree Image from public domain licenseThe motors of many refrigerators require periodic cleaning. If your model is one of these, keep coils free from hampering… https://www.rawpixel.com/image/12307571/image-person-technology-womanFree Image from public domain licenseThat washing machine has to last for a long time, so keep it in good condition. Drain it immediately after use, rinse tub… https://www.rawpixel.com/image/12307028/image-person-woman-waterFree Image from public domain licenseConversion. Copper and brass processing. Stocks of partially completed lengths of seamless copper tube in many sizes. These… https://www.rawpixel.com/image/12107339/image-background-art-vintageFree Image from public domain licenseProduction. Tin smelting. "Bars" of pure tin are trimmed and cleaned before removal from the molds in which they were formed… https://www.rawpixel.com/image/12306990/image-plant-person-factoryFree Image from public domain licenseTo keep your wringer operating properly, dry rolls thoroughly after use with a soft cloth and then release lever which… https://www.rawpixel.com/image/12306608/image-person-cleaning-shoeFree Image from public domain licenseConservation of durable goods. Scarred for life by a sharp button. That's the sad story of this willing but misguided… https://www.rawpixel.com/image/12307035/image-hand-person-blackFree Image from public domain licenseProduction. Shell loading. Every shell that goes through a large Midwest loading plant must be thoroughly cleaned. These… https://www.rawpixel.com/image/12308441/image-plant-person-technologyFree Image from public domain licenseIndustrial safety. Accident prevention. A careless employee has injured a fellow worker by leaving oil spilled on the floor.… https://www.rawpixel.com/image/12306616/image-face-person-artFree Image from public domain licenseProduction. Tin smelting. "Bars" of pure tin are trimmed and cleaned before removal from the molds in which they were formed… https://www.rawpixel.com/image/12307891/image-plant-person-artFree Image from public domain licensePortrait of a mistreated vacuum cleaner. It's in the repair shop because it inhaled bits of metal, pieces of wire… https://www.rawpixel.com/image/12306844/image-plant-hand-personFree Image from public domain licenseHow to conserve household gas. To keep burners clean, wipe them frequently with paper or a cloth. If food boils over, it may… https://www.rawpixel.com/image/12308142/image-paper-hand-personFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. Single-row piston rods for Pratt and Whitney airplane engines are cleaned… https://www.rawpixel.com/image/12307009/image-face-plant-personFree Image from public domain licenseA halftrac scout car must show a clean bill of health before the manufacturer turns it over to the Army. Endless inspections… https://www.rawpixel.com/image/12306578/image-person-technology-womanFree Image from public domain licenseConservation of durable goods. There'll be a long wait between new stoves, so it's smart to take care of the one you've got.… https://www.rawpixel.com/image/12306600/image-hand-tape-woodFree Image from public domain licenseConversion. Copper and brass processing. This is a stock of semi-finished strip copper in rolls. This metal will be rolled… https://www.rawpixel.com/image/12107324/image-person-art-vintageFree Image from public domain licenseThe motors of many refrigerators require periodic cleaning. If your model is one of these, keep coils free from hampering… https://www.rawpixel.com/image/12307033/image-hand-person-technologyFree Image from public domain licenseHow to conserve household gas. When bathing, keep the bathwater down to a minimum. You'll be surprised how easy it is to… https://www.rawpixel.com/image/12307241/image-hand-person-manFree Image from public domain license[Untitled photo, possibly related to: Washington, D.C. Workmen from a monument cleaning company cleaning Shepherd's statue… https://www.rawpixel.com/image/12270896/photo-image-plant-person-skyFree Image from public domain licenseWashington, D.C. Charwoman cleaning after regular working hours at the Office of the Registrar of the Treasury. Sourced from… https://www.rawpixel.com/image/12267868/photo-image-cat-person-animalFree Image from public domain licenseWashington, D.C. Charwoman cleaning after regular working hours at the Office of the Registrar of the Treasury. 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