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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H04M2215/0192
Sponsored, subsidised calls via advertising, e.g. calling cards with ads or connecting to special ads, free calling time by purchasing goods
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