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THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1950 



test set-iip as planned, but il would have been incorporated in any test 

 which includcnl more than one decoder in an office. In such an arrange- 

 ment, the various units illustrated in Fig. 2, except the drum memory 

 assembly-, would be furnished to each decoder. One drum memory assem- 

 l)ly (;iii(l lui (Miici-gency standby) would supply Ihc pattei'n of electrical 



