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Patents
Telephonic Communications Patents
With Audio Message Storage And Retrieval (379/67) Patents
Computer Or Processor Control (379/112) Patents
Call Charge Metering Or Monitoring (379/114) Patents (Class 379/FOR148)
Call Charge Metering Or Monitoring (379/114) Patents (Class 379/FOR148)
Foreign Patent Art Collections
Interexchange operations (379/115) (Class 379/FOR149)
There are no patents to show for this class.