[GreenKeys] GreenKeys Digest, Vol 104, Issue 46

[Don Robert House]

However, I was told by the inventor of the thing, Walt Zenner, that  
the reason
for it was so that they could run TWX switchboards at lower than
120V because it was dangerous to have such a high voltage exposed on
the switchboard cord plugs.
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Absolutely Jim,
Even early M15s had holding magnets.

Best,
Don
K9TTY