PREVENTIVE MAINTENANCE: CIRCUIT BREAKERS

. North. No. 27. PREVENTIVE MAINTENANCE: CIRCUIT BREAKERS. International Business Machines Corp., 1952. 12 min., sd., b&w, 16mm, Summary: Illustrates correct preventive maintenance procedures for plunger type and rocker type circuit breakers. Credits: Authors, Robert John Allen, Eugene August Madlon

Registration MP3595 No renewal found

Term began: 1952-10-06
Claimant: International Business Machines Corp
Class: MP — published motion picture other than a photoplay (numbering series begun Jan. 1950)
Finding: no renewal entry found for 1979-1981 or in the Copyright Office renewal records 1978-2025
In the public domain since: 1 January 1981 (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 1979 or 1980 volume; volumes searched: 1979, 1980, 1981.

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 MP3595.

Catalog entry

Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1953, Internet Archive catalogofcopyrig371213lib (OCR text), lines 16808–16824.

North. No. 27. 


PREVENTIVE MAINTENANCE: CIRCUIT 
BREAKERS. International Business Ma- 
chines Corp., 1952. 12 min., sd., b&w, 
16mm, 

Summary: Illustrates correct preventive 
maintenance procedures for plunger type 
and rocker type circuit breakers. 

Credits: Authors, Robert John Allen, 
Eugene August Madlon. 

© International Business Machines Corp.; 
6Oct52; MP3595.

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