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Lightbulbs in Stand
These light bulbs were manufactured around 1905. They can be dated by the construction of the filament. To learn more about antique light bulbs,…
Tachometer
A tachometer (revolution-counter, Tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a calibrated analogue…