Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04M
TELEPHONIC COMMUNICATION
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2215/00
Metering arrangements; Time controlling arrangements; Time indicating arrangements
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H04M2215/01
Details of billing arrangements
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H04M2215/0156
Secure and trusted billing, e.g. trusted elements, encryption, digital signature, codes or double check mechanisms to secure billing calculation and information
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