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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11/00
Arrangements, systems or apparatus for checking, e.g. the occurrence of a condition, not provided for elsewhere
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G07C2011/02
related to amusement parks
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