Including Means To Advance Material Patents (Class 401/55)
- Compound screw (Class 401/69)
- With means to disengage screw-feed members (Class 401/70)
- Oppositely oriented helices (Class 401/71)
- Material utilized as threaded advancing element (Class 401/72)
- Breech loading implement (Class 401/73)
- With retrograde-movement retarder (Class 401/74)
- Including means to positively transmit rotation to sliding screw-feed member (Class 401/75)
- Directly actuatable cam members (Class 401/79)