Patent classifications
G
PHYSICS
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G08
SIGNALLING
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G08G
TRAFFIC CONTROL SYSTEMS
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1/00
Traffic control systems for road vehicles
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G08G1/14
indicating individual free spaces in parking areas
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G08G1/141
with means giving the indication of available parking spaces
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G08G1/144
on portable or mobile units, e.g. personal digital assistant [PDA]
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