| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Germany | 4 | |
| #3 | United Kingdom | 4 | |
| #4 | Canada | 3 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Electrical machinery and energy | |
| #3 | Control | |
| #4 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Electromechanical clocks | |
| #2 | Electric switches | |
| #3 | Time-interval measuring | |
| #4 | Registering devices | |
| #5 | Unspecified technologies | |
| #6 | Alarm systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Sanner Hulbert | 3 |
| #2 | Hulbert Sanner | 3 |
| #3 | Rollins Arch D | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US1973727A | Annunciator | |
| US1976248A | Dispatcher | |
| US1711812A | Time switch | |
| GB237026A | Improvements in master clocks | |
| GB236318A | Means for controlling electric circuits at predetermined times | |
| GB234963A | Improvements in secondary clocks | |
| GB240198A | Improvements in electric multiple circuit selector systems | |
| US1653313A | Distributing switch | |
| US1526015A | Control resistance bellows | |
| CA257885A | Universal programme machine | |
| CA257884A | Electric connector | |
| CA256855A | Secondary clock system |