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DC ammeter (multiple scales)

DC ammeter (multiple scales)

Weston Electrical Instrument Corporation
1901-1930
foot candle meter

foot candle meter

Weston Electrical Instrument Corporation
1935 - 1945
Dewar flask

Dewar flask

Superior Air Products Company
circa 1966
illumination meter with quartz filter

illumination meter with quartz filter

Weston Electrical Instrument Corporation
1935-1945
one of a pair of photronic cells

one of a pair of photronic cells

Weston Electrical Instrument Corporation
circa 1930
emery abrasive powder

emery abrasive powder

American
circa 1858
pegboard

pegboard

J. L. Hammett Company
circa 1940
D.C. milliammeter

D.C. milliammeter

Weston Electrical Instrument Corporation
circa 1929
reflecting galvanometer with moving coil

reflecting galvanometer with moving coil

Weston Electrical Instrument Corporation
circa 1920
Photronic Cell

Photronic Cell

Weston Electrical Instrument Corporation
circa 1930
Splitdorf RV-695 radio receiver

Splitdorf RV-695 radio receiver

Splitdorf Electrical Company
1926
Brandes paper cone loudspeaker

Brandes paper cone loudspeaker

Brandes Products Corporation
1920-1925
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