| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machine tools | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Machines for making railways | |
| #2 | Sawing | |
| #3 | Unspecified technologies | |
| #4 | Grinding tools | |
| #5 | Working stone | |
| #6 | Grinding or polishing devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Perazzoli Henry J | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US3000325A | Machine for handling railroad ties or the like | |
| US2714774A | Railway ballast excavating chain | |
| US2257480A | Cutter mechanism | |
| US2132861A | Mechanism for clamping mobile units to rails | |
| US2137306A | Cutting or grinding equipment | |
| US2137305A | Grinding equipment | |
| US2106918A | Transmission mechanism | |
| US2118621A | Track grinder | |
| US2077895A | Track grinder | |
| US2058033A | Device for clamping mobile units on railway track rails | |
| US2069900A | Grinding device | |
| US2066050A | Change speed mechanism | |
| US1999943A | Track grinder |