Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01P
MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
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13/00
Indicating or recording presence, absence, or direction, of movement
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G01P13/0006
of fluids or of granulous or powder-like substances
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