{"e":{"id":284950,"source":"ia_catalogofcopyri331213libr","title":"ALTERNATING CURRENT PRINCIPLES","header":"ALTERNATING CURRENT PRINCIPLES. (Radio Electronics. Reel lesson 6) De Forest’s Training, Inc., 1948. 100 feet, b&w, 16mm. Summary: Explains the principles of alternating current--how alternating current is developed, what its operating characteristics are, and how the a-c transformer works","year":1948,"reels":null,"feet":null,"sound":false,"credits":null,"notes":[],"line_start":804,"line_end":816,"source_text":"ALTERNATING CURRENT PRINCIPLES. \n(Radio Electronics. Reel lesson 6) \nDe Forest’s Training, Inc., 1948. 100 feet, \nb&w, 16mm. \n\nSummary: Explains the principles of \nalternating current--how alternating \ncurrent is developed, what its operating \ncharacteristics are, and how the a-c \ntransformer works. \n\n© De Forest’s Training, Inc.; 10ct48; \nMP3899. ","source_meta":{"name":"Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1949","url":"https://archive.org/details/catalogofcopyri331213libr","cite":"Internet Archive catalogofcopyri331213libr (OCR text)","file":"/root/projects/publicreel/data/raw/cce_third_series/1949_catalogofcopyri331213libr_djvu.txt"},"ia_items":[],"ia_lookup":[]},"regs":[{"id":303857,"entry_id":284950,"reg_number":"MP3899","series":3,"see_also":[],"reg_class":"MP","published":true,"claimant":"De Forest’s Training, Inc","author":null,"deposit":null,"reg_date":"1948-10-01","part":null,"part_title":null,"source_line":815,"raw":"nc., 1948. 100 feet, b&w, 16mm. Summary: Explains the principles of alternating current--how alternating current is developed, what its operating characteristics are, and how the a-c transformer works © De Forest’s Training, Inc.; 10ct48; MP3899","flags":[],"status":"no-renewal-found","pd_date":"1977-01-01","reason":"no renewal entry found for 1975-1977 in the CCE motion-picture renewal sections","match_kind":null,"match_confidence":null,"title_similarity":null,"renewals":[],"window":[1975,1976],"window_volumes":[{"year":1975,"ia_identifier":"catalogofcopyrig3291213libr"},{"year":1976,"ia_identifier":"1976motionpictur3301213libr"},{"year":1977,"ia_identifier":"1977motionpictur3311213libr"}]}]}