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Early 1900s technology - Stamp machine ca. 1910-1917
UMG22A54_301

Early 1900s technology - Stamp machine ca. 1910-19...

Early 1900s technology - Outdoor speaker system ca. 1910-1917
UMG22A54_436

Early 1900s technology - Outdoor speaker system c...

Two women using check signing machine which signs checks issued by the War Risk Bureau, Washington, D.C. ca. 1909-1932
UMG22A28_171

Two women using check signing machine which signs ...

Early 1900s technology
UMG22A06_176

Early 1900s technology

Early 1900s technology
UMG22A06_151

Early 1900s technology

Worker operating a new radio teletypewriter service which allows for instantaneous transmission of written records without the aid of wires, has been perfected by the experts of the Bureau of Air Comm...
UMG21A22_093

Worker operating a new radio teletypewriter servic...

F.B.I. guard reports in. Washington, D.C., Aug 4. Officer Ray D. Buckingham using a plug-in telephone, which every guard carries as part of his regular equipment circa 1937.
UMG21A21_011

F.B.I. guard reports in. Washington, D.C., Aug 4. ...

An Early Tuned Circuit
UMG20A21_462

An Early Tuned Circuit

Fleming's First Vacuum Tube
UMG20A21_440

Fleming's First Vacuum Tube