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Antiaircraft gun carriage. A leveling socket for a thirty-seven millimeter antiaircraft gun carriage is machined in a turret lathe. The leveling assembly permits the gun to be kept on an even keel on all types of terrain. War program production scene in one of Pennsylvania's heavy industry plants now converted to the production of vitally needed military equipment. AETNA. Ellwood CIty, Pennsylvania

Antiaircraft gun carriage. A leveling socket for a thirty-seven millim...

Picryl description: Public domain image of an industrial building, factory, workshop, workers, 19th-20th century, free to use, no copyright restrictions.

[Woman using electric iron plugged into light socket]

[Woman using electric iron plugged into light socket]

Photo copyrighted by General Electric Company. This record contains unverified, old data from caption card. Caption card tracings: Household appliances; Electricity; Advertisements; Shelf.

A Brooklyn machine manufacturing firm is seeking machine shop facilities for the machining of very large quantities of Navy brass forgings. Item: socket. Material: Navy brass, two and one-half inches by six inches. Tolerances: plus .002, minus .000. Machines needed: turret lathes, number three Barton and Oliver, number four Warner Swasey or one and one-half inch Jones Lamson. Forgings and inside drilling tools will be furnished

A Brooklyn machine manufacturing firm is seeking machine shop faciliti...

Public domain photograph of New York in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation of durable goods. Is it the news or is it indigestion? Whatever it is, this gentleman's mood is playing havoc with the electric cord. Don't try to disconnect a cord by tugging at it; dislodge it gently but firmly at the wall socket

Conservation of durable goods. Is it the news or is it indigestion? Wh...

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

What's wrong with this picture? Only that the lady is ruining her electric cord by disconnecting the toaster the wrong way. Don't pull cords from irons or toasters: disconnect them gently at the wall socket

What's wrong with this picture? Only that the lady is ruining her elec...

Public domain photograph related to electrical equipment, industrial development, free to use, no copyright restrictions image - Picryl description

Petra. Umm el-Biyarah. (Earliest Nabatean stronghold). Unfinished tomb. Note socket holes for scaffold timbers

Petra. Umm el-Biyarah. (Earliest Nabatean stronghold). Unfinished tomb...

Public domain photograph, 1930s-1940s Jerusalem, Palestine, History of Israel, free to use, no copyright restrictions image - Picryl description