FREQUENCY MODULATION
are entered separately under their respective titles. FREQUENCY MODULATION. (Radio Electronics. Reel lesson 14) DeForest's Training, Inc., 1949. 100 ft., b&w, 16mm. Summary: Describes an f-m receiver, showing how the limiter removes the amplitude modulation and thus provides "Static-less'' reception
Registration MP204 No renewal found
- Term began
- 1949-06-15
- Claimant
- DeForest's Training, Inc
- Class
- MP — published motion picture other than a photoplay (numbering series begun Jan. 1950)
- Finding
- no renewal entry found for 1976-1978 in the CCE motion-picture renewal sections or in the Copyright Office renewal records 1978-2025
- In the public domain since
- 1 January 1978 (end of the 28th year, no renewal)
A renewal would have appeared in the Copyright Office's renewal registrations 27 to 29 years after the term began. Those volumes are loaded and no matching renewal was found. A work published 1931–1963 that was not renewed entered the public domain at the end of its 28th year.
A renewal had to be filed in the 28th year and would be listed in the 1976 or 1977 volume; volumes searched: 1976, 1977, 1978.
Catalog entry
Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1950, Internet Archive catalogofcopyri341213libr (OCR text), lines 6138–6153.
Common Ground Ltd., are entered separ- ately under their respective titles. FREQUENCY MODULATION. (Radio Electronics. Reel lesson 14) DeForest's Training, Inc., 1949. 100 ft., b&w, 16mm. Summary: Describes an f-m receiver, showing how the limiter removes the amplitude modulation and thus provides "Static-less'' reception. © DeForest's Training, Inc.; 15Jun49 (in notice: 1948); MP204.
Copies on the Internet Archive
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