Loudspeaker pressure drive unit

1927 in United States
Western Electric Company, Inc

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Loudspeaker pressure drive unit (Serial No. 17933) made by Western Electric Company, 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)


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overall (standing): 220 mm x 220 mm x 70 mm, 7.61 kg
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