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EQUIPMENT TRANSFERRING BI-DIRECTIONAL TRAFFIC BY SPERATE FREQENCY SIGNALS AND INSERTABLE INTO TWO-WIRE TELEPHONE MAIN ROUTE OR CONNECTABLE TO MAIN ROUTE, FOR AMPLIFYING THE SEPARATE FREQUENCY SIGNALS AND FOR FORMING FOUR-WIRE BRANCHINGS
EQUIPMENT TRANSFERRING BI-DIRECTIONAL TRAFFIC BY SPERATE FREQENCY SIGNALS AND INSERTABLE INTO TWO-WIRE TELEPHONE MAIN ROUTE OR CONNECTABLE TO MAIN ROUTE, FOR AMPLIFYING THE SEPARATE FREQUENCY SIGNALS AND FOR FORMING FOUR-WIRE BRANCHINGS
