Patent classifications
G
PHYSICS
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G07
CHECKING-DEVICES
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G07C
TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
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1/00
Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
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G07C1/20
Checking timed patrols, e.g. of watchman
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