- Back
-
Title: Loudspeaker pressure drive units (two) (Serial Nos [Go to resource]
Description: Loudspeaker pressure drive units (two) (Serial Nos. 17933 & 29351) made by Western Electric, type 555W, designed by Wente, patented 1926 (Bell Telephone Laboratories), impedance 10 ohms at 400 Hz, used in sound-film units, 1927. (Patent Nos. 263411, 266395, 275567, 275571, 297938) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1927 Source: Science Museum Creator: Western Electric (maker) Identifier: 1990-538 Go to resource More Like this...-
Dictograph loudspeaking "master" house-telephone…Dictograph loudspeaking "master" house-telephone unit
[Edit] - Back