| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Measuring force, work and fluid pressure | |
| #2 | Analysing materials | |
| #3 | Unspecified technologies | |
| #4 | Special measuring | |
| #5 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ellison Lewis M | 12 |
| Publication | Filing date | Title |
|---|---|---|
| US2323709A | Nonparallax pointer | |
| US2339847A | Pressure indicator | |
| US1919713A | Draft gauge | |
| US1951603A | Pressure gauge | |
| US1857367A | Pressure indicator | |
| US1615871A | Multiple draft gauge | |
| US1616033A | Draft gauge | |
| US1262761A | Draft-gage. | |
| US1184730A | Draft-gage. | |
| US1145676A | Draft-gage. | |
| US1128669A | Gas-collector. | |
| US1273590A | Draft-gage. |