05-14-2012, 08:19 PM
I think it depended on the office as to whether a radio was allowed, some office intercom systems had a radio built in so if radio was a complete no no they wouldn't have existed. As far as I know that Philco model was not part of an intercom system, if it were then there would be a few more controls then just that thumb wheel. I think that the intent was to create a set with a low profile to sit on a desk or table.
Regards
Arran
Regards
Arran