| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 8 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Machines for making railways | |
| #2 | Locomotives |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lahey Dennis E | 12 |
| #2 | Norton Nathan A | 1 |
| #3 | Jean Glen | 1 |
| #4 | Williams George R | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1527881A | Railway switch | |
| US1468533A | Railway switch | |
| US1435012A | Railway switch | |
| US1435011A | Railway trackage | |
| US1421962A | Railway-switch filler | |
| US1421963A | Railway switch | |
| US1411851A | Railway switch | |
| US909618A | Means for protecting the operatives of railway rolling-stock against injury | |
| CA242099A | Railway switch | |
| CA242100A | Railway switch filler | |
| CA235561A | Railway switch | |
| CA259926A | Railway switch |