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Conversion. Watch cases to war production. Compacts out, war production in. One of the last batches of luxury items is put through a Kentucky watch case plant now engaged in the production of gun parts, fuse baffles, compass cases and other essentials for our fighters. Wadsworth Watch Company, Louisville, Kentucky

Conversion. Watch cases to war production. Compacts out, war productio...

Public domain photograph - working class people, the 1930s United States, work, labor, worker, free to use, no copyright restrictions image - Picryl description

Fort Knox: Tank training. Parade of M-4 (General Sherman) and M-3 (General Grant) tanks in training maneuvers at Fort Knox, Kentucky. Note the lower design of the M-4, the larger gun in the turret and the two batches in front of the turret

Fort Knox: Tank training. Parade of M-4 (General Sherman) and M-3 (Gen...

Picryl description: Public domain image of an American Civil War, military forces and conflict, officer, uniform, free to use, no copyright restrictions.

Blending. Many batches of synthetic rubber latex are batched and blended in concrete storage tanks at the Institute plant. This blending assures uniformity of the product. After blending the rubber content is separated by coagulation

Blending. Many batches of synthetic rubber latex are batched and blend...

Picryl description: Public domain image of an industrial building, factory, workshop, workers, 20th century, free to use, no copyright restrictions.

Official photograph taken on the British Western Front in France. German prisoners in batches of 1,000 arriving at a prisoners of war cage

Official photograph taken on the British Western Front in France. Germ...

Photograph shows a long line of German soldiers, prisoners of war, walking along roadway, somewhere in France. No. L990.

Conversion. Rendering of household fats. Reclaimed household greases from America's kitchens drain into an open vat at a rendering plant. Some of the batches are recooked with additional fats to bring them up to certain specific grades

Conversion. Rendering of household fats. Reclaimed household greases f...

Public domain photograph of 1930s-1940s industrial development, no copyright restrictions image - Picryl description

A black and white photo of bags of cement. Office of War Information Photograph

A black and white photo of bags of cement. Office of War Information P...

Public domain photograph - United States during the 1930s and 1940s, Farm Security Administration, New Deal, free to use, no copyright restrictions image - Picryl description

The mill room. Measured batches are delivered to these tire workers, who worked in a room full of batteries of rolling mills. Here, by a rolling process, the rubber is squeezed, pulled, pounded and mixed with the other ingredients until all are blended into a "treated rubber" stock. Firestone (General Tires), Akron, Ohio

The mill room. Measured batches are delivered to these tire workers, w...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description

The 90-gallon water-jacketed kettle in which 3-4 batches of sauce are prepared each week at the Hot Grill.

The 90-gallon water-jacketed kettle in which 3-4 batches of sauce are ...

Public domain photograph - historical image of Texas, United States, free to use, no copyright restrictions image - Picryl description