Automatic Patents (Class 246/27)
- Radiant energy (Class 246/29R)
- Propulsion-current control (Class 246/31)
- Single track (Class 246/33)
- Varying-current track circuit (Class 246/34R)
- Direct current, normally closed, track circuit (Class 246/41)
- Direct-current, normally open, track circuit (Class 246/58)
- Superimposed propulsion current (Class 246/61)
- Cab signal or train control (Class 246/62)
- Counting in and out (Class 246/77)
- Propulsion-current signaling (Class 246/81)
- Train-carried current supply (Class 246/86)
- Line-current supply (Class 246/87)
- Ballast leakage (Class 246/28C)
- Economy use of line wire (Class 246/28E)
- Checking circuits (Class 246/28F)
- Light-out (Class 246/28G)
- Intermittent light (Class 246/28H)
- Transformer (Class 246/28K)