US PATENT SUBCLASS 379 / 91.02
.~.~ At switching station

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

90.01  DF  TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE) {8}
91.01  DF  .~ Credit authorization {1}
91.02.~.~ At switching station

DEFINITION

Classification: 379/91.02

At switching station:

(under subclass 91.01) Subject matter including a switching facility having structure or circuitry for credit transaction processing.