Hook Type Projection Member Patents (Class 24/598.4)
- Threaded gate (Class 24/598.8)
- Revolvably mounted disc shaped gate (Class 24/598.9)
- Pivotally connected gate (Class 24/599.1)
- Track or way guided gate (Class 24/600.4)
- Resilient, self-biased gate (Class 24/600.9)