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rectangular ivory diptych sundial

rectangular ivory diptych sundial

Georg Karner
1679-1700
Phelps single crown receiver (or transmitter)

Phelps single crown receiver (or transmitter)

Societé du Telephone Edison
1879-1880
saccharimeter (polaristrobometer)

saccharimeter (polaristrobometer)

Hermann & Pfister
circa 1872
2-foot Gregorian reflecting telescope

2-foot Gregorian reflecting telescope

Claude-Siméon Passemant
1740-1769
WE model 26A horn with 594A field coil driver loudspeaker

WE model 26A horn with 594A field coil driver loudspeaker

Western Electric Company
circa 1936
Acme Reproducer Single Free Edge Cone type K-3 loudspeaker

Acme Reproducer Single Free Edge Cone type K-3 loudspeaker

ACME Apparatus Company
1926-1927
Cylindrical Transducer part for Magnavox Radio R3-B early horn loudspeaker

Cylindrical Transducer part for Magnavox Radio R3-B early horn loudspeaker

Magnavox Company
1921
steam engine high-pressure gauge

steam engine high-pressure gauge

J. E. Lonergan Company
1950 - 1970
Fessel-type gyroscope

Fessel-type gyroscope

American
1920-1940
one of a pair of photronic cells

one of a pair of photronic cells

Weston Electrical Instrument Corporation
circa 1930
steam engine high-pressure gauge

steam engine high-pressure gauge

Crosby Steam Gage & Valve Company
1940-1950
dividers / calipers

dividers / calipers

American
circa 1917
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