Arc Preventing Or Extinguishing Devices Patents (Class 218/1)
- Polyphase (Class 218/44)
- Disconnect switch (Class 218/45)
- Arcing chamber (Class 218/46)
- Contact structure (Class 218/48)
- With gas flow means (Class 218/51)
- With nozzle (Class 218/53)
- Grounding switch (Class 218/55)
- Self extinguishing (Class 218/56)
- Puffer piston (Class 218/57)
- Sealed chamber (Class 218/68)
- Arc chute (Class 218/81)
- Identical units back-to-back (Class 218/82)
- Recirculating systems (Class 218/83)
- Operating mechanism structure or arrangement (Class 218/84)
- Arc extinguishing medium (Class 218/85)
- Low pressure cut-off valve means (Class 218/86)
- Magnetic synchronous contacts (Class 218/87)
- Control of blast valve and contacts (Class 218/88)