Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04M
TELEPHONIC COMMUNICATION
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17/00
Prepayment; of wireline communication systems, wireless communication systems or; telephone systems
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H04M17/02
Coin-freed or check-freed systems; , e.g. mobile- or card-operated phones, public telephones or booths
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H04M17/026
Constructional features
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