Processes Patents (Class 137/1)
- Repairing or assembling hydrant (e.g., fireplug, etc.) (Class 137/15.02)
- Gas or water meter repairing or assembling (Class 137/15.03)
- Fluid cleaning or flushing (Class 137/15.04)
- Mechanical cleaning (e.g., pig, etc.) (Class 137/15.07)
- Repairing, securing, replacing, or servicing pipe joint, valve, or tank (Class 137/15.08)
- Valve or valve element assembling, disassembling, or replacing (Class 137/15.18)