Intercom Phones

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Can you help with any information about these unusual intercom telephones. They are based on the GPO 706 phone, first released in the late 1950s but seem to have been modified into intercoms at some point in their life. Other pairs of these phones have been seen, so was someone converting them professionally? Please leave your thoughts in the comments section. ... https://www.youtube.com/watch?v=T6NjF_G-RYo

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