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There were 3 standard 1" video tape formats in the 70s Type-A (Ampex designed), Type-B (Bosch designed and mostly a euro format) and Type-C. C was the only thing that was good enough for broadcast in the US, but I could see Cuba using any of the 3 or a non-standard Japanese format (I know from 1963 until around 1970 Sony had their own 1" format but I don't know about NEC.
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