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BELL SYSTEM TECHNICAL JOURNAL 



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Fig. 21 — Details of construction for small concentric lines suitable for station 

 wiring and for patch cords. The plug-and-jack union is an effective scheme for 

 temporarily connecting two small lines. 



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Fig. 22 — An experimental radio-frequency jack board terminal for small con- 

 centric-tube lines. Path cords are constructed in the manner depicted in Fig. 21. 



