| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 5 | |
| #2 | United States | 4 | |
| #3 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Guiding railway traffic |
| # | Name | Total Patents |
|---|---|---|
| #1 | Shoecraft Judson | 10 |
| #2 | Gardiner Charles Carroll | 2 |
| #3 | Gardner Charles C | 1 |
| #4 | Gardiner Charles C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA179713A | Block signal system | |
| US1229155A | Absolute and permissive block-signaling. | |
| CA110833A | Signalling system | |
| US840095A | Automatic signal. | |
| US816259A | Automatic gearing device. | |
| US795864A | Reversing mechanism. | |
| GB190013765A | Improvements in Automatic Electric Block Systems for Railroads. | |
| CA70309A | Electric block system for railways | |
| CA69893A | Electric railway signal | |
| GB190005389A | Improvements in and/or conected with Electrically Operated Railway Signals. | |
| CA70308A | Electrical semaphore system |