Video #229
Looks like maybe it could work via the phone line power alone but the batteries are there as a backup so you don't lose your numbers. Also maybe they didn't bother with relays and just required you to lift your handset before dialling? Interesting!
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Looks like maybe it could work via the phone line power alone but the batteries are there as a backup so you don't lose your numbers. Also maybe they didn't bother with relays and just required you to lift your handset before dialling? Interesting!