By Testing Material Composition Patents (Class 194/303)
- Circuit includes thermocouple (Class 194/305)
- Circuit includes three or more contacts (Class 194/306)
- Circuit includes movable contact (Class 194/307)
- And means to impart thrust to check (Class 194/310)
- And means to stop check at contact (Class 194/312)
- Circuit includes spring contact (Class 194/315)
- Circuit includes elongated contact (e.g., long slide, etc.) (Class 194/316)