Radio Messages
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✎ Suggest a correctionEB Films. Sound waves, direct currents, alternating currents, voice current, carrier wave and amplification as basis of radio are explained, with microphone, transformer and the modulator shown in operation.
Complete catalog record
Category: Electronics
Subcategory: O.I.A.A.
Type: Motion Picture
Price: $50.
Format code: 16sd
Subcategory: O.I.A.A.
Type: Motion Picture
Price: $50.
Format code: 16sd
Sources
- Index of Training Films 1946 — title, length, format, sound, description, catalog record
Record added 2026-07-09 22:50:35 · Suggest a correction