International Film Service
Possible match — there are several people named International Film Service; this may not be the one in these credits.
animation studio by William Randolph Hearst
International Film Service (IFS) was an American animation studio created to exploit the popularity of the comic strips controlled by William Randolph Hearst.
Filmography in the catalog
Credited on 182 films (1916–1922) — matched by name in the Creator or Credits field. Also mentioned in 11 other records (descriptions, transcriptions, copyright notes).