El Bulbo Al Vacío.

Duration: 1 reel

Year Published: 1947

Format: 16mm

Color: B&W

Sound: sound

Complete Record: EL BULBO AL VACÍO. Encyclopaedia Britannica Films, Inc., in collaboration with Wilbur L. Beauchamp, c1947. 1 reel, sd., b&w, 16mm. Spanish version of "Vacuum Tubes." © Encyclopaedia Britannica Films, Inc.; 4Feb47; MP1674.

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