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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H04M17/20
with provision for recharging the prepaid account or card, or for credit establishment
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H04M17/204
on-line recharging, e.g. cashless
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H04M17/207
using signaling, e.g. USSD, UUS or DTMF
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