Which electro mechanical switch had fewer moving parts, Computer Engineering

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The            electro mechanical switch (developed in 1938) had fewer moving parts than earlier switches.

(A)  No. 1ESS                                 (B)  Strowger

(C) Step-by-step                           (D)  Crossbar

Ans:

The Crossbar electro mechanical switch which is developed in 1938 year had fewer moving parts than prior switches.


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