[GreenKeys] Ionotron

[Hugh Pyle]

I found a longer article (1959) that talks about the hazards,
https://ajph.aphapublications.org/doi/pdf/10.2105/AJPH.40.8.943

It seems that AT&T should have a record of each unit's serial number:
https://www.navy-radio.com/manuals/tty/p-series/P31.154.1.pdf


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