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Aluminum casting. In this large Midwest factory converted to production of war essentials two workmen are pictured boring holes in the base of 37-millimeter armour piercing shot where primers will be inserted. Aluminum Industries Inc., Cincinnati, Ohio. Sourced from the Library of Congress.

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Aluminum casting. In this large Midwest factory converted to production of war essentials two workmen are pictured boring holes in the base of 37-millimeter armour piercing shot where primers will be inserted. Aluminum Industries Inc., Cincinnati, Ohio. Sourced from the Library of Congress.

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