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Photomultiplier
Providence 1990
Maszyna Trurla
Standard Unit
Chitty Chatty
Hydrogen Thyratron
Tango
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GL-869B
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Conqueror Worm
Cherry Wainer
WWII Radar
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Photo Editing 1907
RCS Online Library
All I Remember of Earth

Standard Unit

All food calibration in the US traces back to this piece of Candy Corn, the NIST reference unit for food.