Loudspeaker pressure drive unit (Serial No. 17933) made by Western Electric Company
- Object Number:
- 1990-538/1
- type:
- loudspeakers
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)