| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Machines | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Electric switches | |
| #2 | Unspecified technologies | |
| #3 | Electric motor controls | |
| #4 | Resistors | |
| #5 | Soldering, welding and flame cutting | |
| #6 | Magnets and transformers | |
| #7 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Campbell Harry E | 8 |
| #2 | Mekelburg Earl F | 2 |
| #3 | Keeney Charles H | 2 |
| #4 | Rhine Charles A | 2 |
| #5 | Watson Thomas S | 1 |
| #6 | Brown Roy W | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1649809A | Method of assembling sheet-metal resistance units | |
| US1753016A | Electric switch | |
| US1638617A | Electric switch | |
| US1553595A | Electric switch | |
| US1621233A | Controlling device | |
| US1585017A | Magnet-coil assembly | |
| US1652391A | Electric controller | |
| US1629951A | Starting box for controlling the electric current to machine motors | |
| US1295040A | Multiple switch. | |
| US1059416A | Switch. | |
| US701012A | Rheostat. | |
| CA275710A | Resistance element |