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539 items
Photonic Cell
Photonic Cell
Mounted Transcontinental Cable Section
Telegraph Key CJB26003A
Telegraph Key Bakelite Base
Telegraph Key on Metal Box
Telegraph Sounder
Cable with Many Wire Pairs
Black Rotary Dial
Large White Rotary Dial
Gray Keypad
Pair of Switches
Black Rotary Dial Desk Phone
Rotary Dial Wall Phone
Phone Receiver
Candlestick Phone ca 1900
Candlestick Phone Modified for Dial ca 1900
Microscope
Spencer Microscope 115833
Solar Microscope
Microscope Polarizers
Drawing Instruments in Leather Case
6 inch Silicon Wafer with 386 Chips
Grinnell College's First Adding Machine
of 23
409–432 of 539