Phonofilm sound-on-film process

GPTKB entity

Predicate	Object
gptkbp:instanceOf	gptkb:sound-on-film_technology
gptkbp:commercialSuccess	limited
gptkbp:competitor	gptkb:Movietone gptkb:Vitaphone
gptkbp:countryOfOrigin	gptkb:United_States
gptkbp:firstDemonstrated	gptkb:Rivoli_Theater,_New_York_City
gptkbp:historicalSignificance	early sound film technology
gptkbp:introducedIn	1923
gptkbp:inventedBy	gptkb:Lee_de_Forest
gptkbp:notableFilm	gptkb:A_Few_Moments_with_Eddie_Cantor,_Star_of_'Kid_Boots' gptkb:President_Coolidge,_Taken_on_the_White_House_Grounds
gptkbp:notablePerson	gptkb:Theodore_Case gptkb:E._E._Kellogg
gptkbp:patent	1922
gptkbp:precededBy	gptkb:silent_film
gptkbp:recordedAt	35mm film
gptkbp:soundRecordedAs	variable-density optical track
gptkbp:successor	gptkb:Movietone_sound_system
gptkbp:technology	optical sound recording
gptkbp:usedBy	gptkb:De_Forest_Phonofilm_company
gptkbp:usedFor	synchronizing sound with motion pictures
gptkbp:bfsParent	gptkb:De_Forest_Phonofilm_Company
gptkbp:bfsLayer	6
https://www.w3.org/2000/01/rdf-schema#label	Phonofilm sound-on-film process