Elements Patents (Class 112/270)
- With thread wiping (Class 112/286)
- With thread disposal by air flow (Class 112/287)
- Thread chain (Class 112/288)
- Rotary type (Class 112/289)
- Hot wire type (Class 112/290)
- Upper and lower threads (Class 112/291)
- Upper thread (Class 112/293)
- Lower thread (Class 112/296)
- Manual control (Class 112/299)
- Electrically actuated (Class 112/300)
- Fluid actuated (Class 112/301)