NASA image of Pioneer 10's famed Pioneer plaque features a design engraved into a gold-anodized aluminum plate, 152 by 229… https://www.rawpixel.com/image/8717942/photo-image-gold-public-domain-womanFree Image from public domain licenseTape measure png in hand sticker on transparent background https://www.rawpixel.com/image/6260895/png-sticker-elementView licenseWooden ruler png sticker, transparent background https://www.rawpixel.com/image/8698742/wooden-ruler-png-sticker-transparent-backgroundView licenseTape measure png in hand, transparent background https://www.rawpixel.com/image/9243571/tape-measure-png-hand-transparent-backgroundView licenseWooden ruler collage element psd https://www.rawpixel.com/image/8698743/wooden-ruler-collage-element-psdView license[Frankford Arsenal, Philadelphia, Pennsylvania.] Bertha Stallworth, age twenty-one, inspecting the end of a forty millimeter… https://www.rawpixel.com/image/12242087/photo-image-face-hand-personFree Image from public domain licenseHand holding variation of object https://www.rawpixel.com/image/379292/premium-psd-measuring-tape-measure-waistView licenseWooden ruler isolated design https://www.rawpixel.com/image/8567951/wooden-ruler-isolated-designView licenseMan measuring with yellow meassure tape https://www.rawpixel.com/image/404312/premium-photo-image-precision-centimeter-constructionView licenseMeasure Tape Length Millimeter Centimeter Inch https://www.rawpixel.com/image/240139/premium-photo-image-background-casual-centimeterView licenseAluminum casting. In this large Midwest factory converted to production of war essentials two workmen are pictured boring… https://www.rawpixel.com/image/12302109/image-person-factory-manFree Image from public domain licenseAluminum casting. Thirty-seven-millimeter armour piercing shot used in anti-tank guns are produced in this giant Midwest… https://www.rawpixel.com/image/12301958/image-background-factory-gunsFree Image from public domain licenseProduction. 105 millimeter shells. Working with precision and speed, inspectors in a large idwest war plant gauge 105… https://www.rawpixel.com/image/12302171/image-plant-person-factoryFree Image from public domain licenseConversion. Safe and lock company. Millimeter guns for America's armed forces are assembled in a factory once devoted to… https://www.rawpixel.com/image/12302150/image-person-factory-gunFree Image from public domain licenseProduction. 105 millimeter shells. Plumbing fixtures came off these assembly lines in peace time, but today Giles Knowles… https://www.rawpixel.com/image/12302233/image-plant-person-baseballFree Image from public domain licenseProduction. 105 millimeter shells. One of the many women workers in a Midwest shell plant which formerly made plumbing… https://www.rawpixel.com/image/12306441/image-plant-person-explosionsFree Image from public domain licenseTo save time in checking threads on a twenty-millimeter shell booster, a plant superintendent built this machine. It makes… https://www.rawpixel.com/image/12306826/image-plant-hand-personFree Image from public domain licenseAs a test, three rounds of primers in empty shell cases are fired in each howitzer to check the breech mechanism. The firing… https://www.rawpixel.com/image/12237112/image-plant-person-smokeFree Image from public domain licenseConversion. Safe and lock company. Guns to blast the Axis from the earth. A factory which formerly produced locks and safes… https://www.rawpixel.com/image/12306803/image-person-technology-earthFree Image from public domain licenseA standard turret lathe being used for boring operations on seventy-five millimeter pack howitzers at the Erie… https://www.rawpixel.com/image/12237058/image-plant-person-factoryFree Image from public domain licenseCutting thread sectors on a howitzer with a shaper, in the Erie, Pennsylvania, General Electric plant. A dividing head… https://www.rawpixel.com/image/12237057/image-plant-person-technologyFree Image from public domain licenseTo save time in checking threads on a twenty-millimeter shell booster, a plant superintendant built this machine. It makes… https://www.rawpixel.com/image/12107322/image-plant-hand-personFree Image from public domain licenseProduction. 105 millimeter shells. Carefully stacked prior to shipment, thousands of shining shells await shipment to the… https://www.rawpixel.com/image/12306437/image-face-plant-personFree Image from public domain licenseProduction. 105 millimeter shells. This red-hot billet is undergoing processing in a hydraulic press, where it will be… https://www.rawpixel.com/image/12306427/image-person-factory-manFree Image from public domain licenseProduction. 105 millimeter shells. In a Midwest foundry where plumbing fixtures were formerly processed, hot billets, soon… https://www.rawpixel.com/image/12306443/image-person-woman-factoryFree Image from public domain licenseA row of seventy-five millimeter pack howitzers being assembled in the Erie, Pennsylvania, General Electric plant while… https://www.rawpixel.com/image/12236091/image-plant-people-technologyFree Image from public domain license