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[* black] Turning the zeroing crank counterclockwise sets the counter digits to zero, while turning it clockwise sets the accumulator digits to zero. Amazing!
-[* black] Nelson White's 1920 patent [http://www.google.com/patents?id=lARhAAAAEBAJ|Zero-setting mechanism] describes how this amazing thing works.
-[* black] This amazing thing practically never works properly on calculators after half a century of neglect.
-[* black] On the right side of the carriage, unscrew and remove the zeroing crank.
+[* black] Nelson White's U.S. patent "[http://www.google.com/patents?id=lARhAAAAEBAJ|Zero-setting mechanism]", filed in 1920, describes how this amazing thing works.
+[* black] This amazing thing practically never works properly after half a century of neglect.
+[* black] On the right side of the carriage, unscrew and remove the zeroing crank. Hold the crank while unscrewing.
[* red] 4-48 machine screw, 1/4"
[* red] Zeroing crank

Afbeelding 1

Oude versie

Nieuwe versie

Afbeelding 2

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