Phonograph recorders and players

• "Associated Package and Sound Record", L. S. Labowitz, US Patent 2020381. 1935
• "Book with Talking Pages", W. R. Hicks, US Patent 2997306. 1961
• "Auditory Publications", C. K. Shaw, US Patent 3145026. 1964
• "Sound Reproducing device for Dolls and the Like", A. J. P. Van Den Hurk, US Patent 3220143. 1965
• "Phonographic Devices", L. H. Ottofy, US Patent 3269734. 1966
• "Camera and Sound Recording Device", D. M. Weitzner, US Patent 3439598. 1969
• "Acoustic Phonograph Apparatus", Richard J Mayer, US Patent 3746346. 1973

• Cardboard record players

  • "Pocket Speaking Device", Jean Jauquet, US Patent 2859974. 1958
  • "Sound Emitting Device", J.S. Weiner, US Patent 3415526. 1968
  • "Record Player", Max Meier-Maletz, US Patent 3822064. 1974

Magnetic recorders and players

• "Method of Recording and Reproducing Sound or Signals", Valdemar Poulsen, US Patent 661619. 1900.
• "Device for Magneto-electric Generation of Alternating Currents for Sound Production ", US Patent 1941036. 1930
• "Sound Reproducing Mechanism", P. A. Robbins, US Patent 1799322. 1931. lateral shift in flux, like optical recording.
• "Projecting Mechanism", W. G. H. Finch, US Patent 2136209. 1938. sound for cartoons.
• "Method for Recording Information on Stationary Magnetic Material", P. B. Murphy, US Patent 2511121. 1950. see also A. H. Frisch.
• "Editing and Inspection of Invisible Sound Tracks", D. L. Blaney, US Patent 2530564. 1950. visible inspection of magnetic tracks
• "Slotted Hall-effect Transducer", F Kuhrt et al, US Patent 2987581. 1961. siemens company
• "Magnetic Eraser", H. J. Kump, US Patent 3156784. 1964. uses rotating electromagnets.
• "Sound Volume Controller for Electronic Musical Instruments", A Nakada, US Patent 3217081. 1965. variable transformer coupling as volume pedal.
• "Magnetically Conductive Ink Recording System", M Schwartz, US Patent 3344238. 1967
• "Snap-on erase Member for Compact Cassette Recorder", E. R. Wiklund, US Patent 3612774. 1969
• "Nonelectronic Magnetic Recording System", W. C. Carroll, US Patent 3479036. 1969
• "Recording-reproducing Apparatus for Teaching Cards", W. H. Lyon, US Patent 3488867. 1970
• "Instrument Using Intermediate Storage for Reproducing Prerecorded Information", A. E. Dubord, US Patent 3529101. 1970. magnetic book and pen.
• "Handheld Transducer Operating state Indicator", M Kamenir, US Patent 3668333. 1972.

Optical recorders and players

• "Improvements Relating to Revolving Rooms for Amusement", Eugene Lauste, British Patent GB190424067A. 1905
• "A New or Improved Method of and Means for Simultaneously Recording and Reproducing Movements and Sound", Eugene Lauste, British Patent GB190618057A. 1907
• "Improvements in Apparatus for the Reproduction of a Combined Photographic Record of Movement and Sound", Eugene Lauste, British Patent GB191316941A. 1913
• "Improvements in and Relating to Sound Recording and Reproducing Devices and the like", Eugene Lauste, British Patent GB191210526A. 1913
• "Improvements in and relating to Apparatus for use in the Photographic Recording of Sound", Eugene Lauste, British Patent GB191316942A. 1913
• "Talking Cartoon Motion Picture", F. H. Owens, US Patent 1809599. 1931
• "Photo electric system for Recording and Reproducing Sound", J. H. Hammond, US Patent 1967882,1934.
• "Reproducing Apparatus and Method", A. A. Kucher, US Patent. 1936
• "Recording of Oscillations on a Carrier", James A Miller, US Patent 2034111. 1936
• "Verfahren und Vorrichtung zur Herstellung einer Schwingungaufzeichnung", James A Miller, Austrian Patent AT147264B. 1936
• "Sound Recording System", W. G. H. Finch, US Patent 2109627. 1938
• "Apparatus for Analyzing complex Waves", T. H. Long, US Patent 2491189. 1949
• "Apparatus for Analyzing complex Waves", E. L. Kent, US Patent 2491186. 1949
• "Visual Representation of Complex Waves", R. R. Riesz, US Patent 2500646. 1950
• "Optical Sound Recording and Reproduction", F. P. Beguin, US Patent 3235672. 1966
• "Recording and Reproduction of Intelligence Signals", R. R. McDaniel, US Patent 3396243. 1968
• "Optical Sound-Recording Apparatus", W. K. Bender, US Patent 3370133. 1968