Mechanical Conversion To Or From Sound Patents (Class 369/155)
- With interchangeable styli (Class 369/161)
- Including stylus pivoted from fixed casing (Class 369/162)
- With sound modification (Class 369/163)
- Convertible between lateral and perpendicular modulation modes (Class 369/164)
- Perpendicular mechanical modulation (Class 369/165)
- Lateral mechanical modulation (Class 369/169)