Labels:autoradiograph | earth | sky OCR: GP RP Wiring to ather tine relay sets ES RS Four- -wire Direction of transmission Faur-wire circuit circuit GRO GRA RC ES Wiring to other line relay sets GP CCITT-49230 GP pilot generator RF pilot receiver RS signalling receiver signalling sender GRD outgoing relay set GRA incoming retay set FIgurE 10/Q .416 Protection from the effect of interruptions tinterruption control) signatling interruption
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