Chance Devices Patents (Class 273/138.1)
- Edge indication (Class 273/143R)
- Indicator: projected (Class 273/142A)
- Indicator: electrical (Class 273/142B)
- Indicator: optional (Class 273/142C)
- Indicator: free element (Class 273/142D)
- Ball indicator-pocketed disc (Class 273/142E)
- Ball indicator-notched disc (Class 273/142F)
- Ball indicator-stationary pocket (Class 273/142G)
- Plural disc (Class 273/142H)
- Indexing (Class 273/142J)
- Phonograph mounted (Class 273/142K)