TRIGONOMETRIC RATIOS AS PERIODIC FUNC- TIONS
TRIGGER POINT. SHE LARAMIE. TRIGONOMETRIC RATIOS AS PERIODIC FUNC- TIONS. Calvin Productions. 28 min., sd., b&w, 16 mm
Registration MP12101 No renewal found
- Term began
- 1961-04-28
- Claimant
- Calvin Productions, Inc
- Class
- MP — published motion picture other than a photoplay (numbering series begun Jan. 1950)
- Finding
- no renewal entry found for 1988-1990 or in the Copyright Office renewal records 1978-2025
- In the public domain since
- 1 January 1990 (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 1988 or 1989 volume; volumes searched: 1988, 1989, 1990.
The renewal sections are OCR text of printed volumes; a damaged record can hide a renewal. Before relying on this, search the linked volumes yourself for the title and for number MP12101.
Catalog entry
Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1962, Internet Archive catalogofcopyr3161213libr (OCR text), lines 13413–13418.
TRIGGER POINT. SHE LARAMIE. TRIGONOMETRIC RATIOS AS PERIODIC FUNC- TIONS. Calvin Productions. 28 min., sd., b&w, 16 mm. © Calvin Produc- tions, Inc.; 28Apr61; MP12101.
Copies on the Internet Archive
Not searched yet.