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A munitions factory, World War I, 1917 (1938). Artist: Horace Walter NichollsA munitions factory, World War I, 1917 (1938). Munitions workers with shells in a warehouse at National Shell Filling Factory No 6 at Chilwell, Nottinghamshire
Sheet metal workers at a aeroplane factory, World War I, 1914-1918. Artist: Realistic Travels PublishersSheet metal workers at a aeroplane factory, World War I, 1914-1918. Stereoscopic card detail
Crabtrees Card Setting Machine, 1866
Macindoes Self Acting Mule, 1866
Milk production, Zagreb, Yugoslavia, 1952. With help from UNICEF
5c American Authors Louisa May Alcott die proof attached to plate proof, 14598. Certified plate proofs are the last printed proof of the plate before printing the stamps at the Bureau of Engraving
3c Pan American Union die proof attached to plate proof, 14682. Certified plate proofs are the last printed proof of the plate before printing the stamps at the Bureau of Engraving and Printing
4 1 / 2c White House approved large die proof, 14072. Creator4 1/2c White House approved large die proof, 14072. 4 1/2-cent White House Large Die Proof, originally attached by staples to certified plate proof 21972 as a reference copy for the Bureau of