Arrangements For The Associated Working Of Recording Or Reproducing Apparatus With Related Apparatus (with Cameras Or Projectors G03b31/00; [n: Recording/reproducing Of Music For Electrophonic Musical Instruments G10h1/00r; Automatic Arrangements For Answering Calls Or For Recording Messages For Absent Subscribers H04m1/64; Telephonic Communication Systems Adapted For Combination With Dictation Recording And Playback Systems H04m11/10; Connection Of Tv Recorder With Other Related Apparatus, E.g. Tv Camera Or Receiver, In Which The Tv Signal Is Significantly Involved H04n, E.g. H04n5/225, H04n5/765; Combination Of Radio Or Tv With Other Apparatus, E.g. With Vehicles H05k11/00]) {g11b 31/00} Patents (Class G9B/31)