. Bell telephone magazine . RINCEH FORREGULAR LINE FIGURE A STATION EQUIPMENT FOR SECRETARIAL LINE WITH CONTROLAT BOARD. - ARRANGED FOR AUTOMATIC CUT-OFF. DISTRIBUTING FRAME LOBBY • SECRETARIAL LINES-HOUSE SERVICE LINES-PBK STATION LINES-TRUNKS TO CENTRALOFFICE -SECRETARIAL BOARD -PBX. STATION LINE- SECRETARIAL LINE • HOUSE SERVICE LINE■TRUNK TO CENTRAL OFFICE BASEMENT —RELAr RACK Fig. 3. Control of Secretarial Line at Board, Arranged for Automatic Cut-off. 141 BELL TELEPHONE QUARTERLY

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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922