| All Patents of Type: audio-visual apparatus |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 3,229,539 | Jan. 18, 1966 | L.J. Ablon | Pause Control for Phonograph Driving Mechanism | audio-visual apparatus |
| 3,365,817 | Jan. 30, 1968 | R.T. MacFarlane | Teaching Machine | audio-visual apparatus |
| 3,451,142 | Jun. 24, 1969 | R.H. Hartjen | Teaching Machine | audio-visual apparatus |
| 3,629,910 | Dec. 28, 1971 | C.C. Hsiao, R.C. Kirberg | Handle Assembly for Picture Projection Screen | audio-visual apparatus |
| 3,680,754 | Aug. 01, 1972 | F.L. Blaakman, R.N. McFadden | Filmstrip Advancing Mechanism | audio-visual apparatus |
| 3,737,220 | Jun. 05, 1973 | I. Delin, deceased (Estate of), R.N. McFadden, R.E. Hickey | Slot-Load Projector | projectors |
