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Optical Isolator

Anybody know of a BID 750/1 ?

Optical isolation unit I think.

Grey steel box 26 cm by 14 cm by 14 cm.

Two power leads (red/black?) and two three pin input/output socket.

Oh yes OPSEC if it did exsist its 1950/60 technology and would have been scrapped 20 yeras ago.

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