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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H04M2215/81
Notifying aspects, e.g. notifications or displays to the user
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H04M2215/815
Notification when a specific condition, service or event is met
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H04M2215/8158
Low balance or limit reached
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