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History
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Anniversary clock manufactured by S. Haller & Söhne Co.
Anniversary clock manufactured by S. Haller & Söhne Co.
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A mousetrap powered by a helical torsion spring
A mousetrap powered by a helical torsion spring
Torsion balance used by Paul R. Heyl in his measurements of the gravitational constant G at the U.S. National Bureau of Standards (now NIST) between 1
Torsion balance used by Paul R. Heyl in his measurements of the gravitational constant G at the U.S. National Bureau of Standards (now NIST) between 1930 and 1942.