[BC] 110 V DC AC/DC radios 5 tube all american

[Milton R. Holladay Jr.]

The oldest _receptecle_ that I can remember seeing had a wide and a narrow
slot for a polarized plug
M
----- Original Message ----- 
From: <nakayle at gmail.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Saturday, December 02, 2006 9:38 PM
Subject: Re: [BC] 110 V DC AC/DC radios 5 tube all american
> As for polarized plugs I don't know why it took them so long to start
> requiring those but I don't think I saw them on electronic stuff until
> the early 1970s.  Now nearly everything has them.
>