1178 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1956 



may be accounted for, in part, by the fact that most of the component 

 parts are telephone type apparatus designed for heavy duty use. 



A maintenance feature is the use of 18 specially coded tapes which, 

 together with a properly strapped input plug, permit the maintenance 

 technician to obtain indications on the lamp display panel of the per- 

 formance of the set. 



Nearly three thousand tapes have been coded to date. Of these ap- 

 proximately two thousand are in active use on the many types of wired 

 relay units made at the Kearny plant. More tapes are being added 

 weekly as the Bell System telephone plant grows in size and complexity. 



CONCLUSION 



Automatic testing of wired relay switching circuits has been success- 

 fully applied to the manufacture of these equipments at the Kearny, 

 New Jersey, plant of the Western Electric Company for a number of 

 years. Even though the total production is large, manufacture is essen- 

 tially of a job lot nature due to large number of types made and is further 

 compounded by the optional circuit arrangments that may be ordered. 

 The solution to the problem was found through provision of flexibility 

 in programing and cross connection leading to quick setup, rapid testing 

 and improved transmittal of essential information to the tester to aid 

 him in clearing circuit faults. 



