| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 6 | |
| #2 | United States | 5 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Transport | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Vehicle drive control systems | |
| #2 | Unspecified technologies | |
| #3 | Clutches and brakes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Mccollum James H K | 11 |
| #2 | Mccollum Henry J De N | 4 |
| #3 | Mccollum Thomas E B | 1 |
| #4 | Mc-Collum Henry J De N | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2180537A | Motor vehicle clutch control mechanism | |
| US2219270A | Automatic clutch actuating mechanism | |
| US2193487A | Manually controllable automatic clutch-operating mechanism | |
| US2071983A | Vacuum power clutch | |
| US2181491A | Vacuum power clutch | |
| CA135026A | Train stop mechanism | |
| CA124041A | Steam engine | |
| CA106344A | Stop mechanism for railway vehicles | |
| CA67085A | Rotary valve | |
| CA66171A | Steam engine | |
| CA65387A | Steam engine |