| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 16 | |
| #2 | Canada | 3 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Electrical machinery and energy | |
| #3 | Telecommunications | |
| #4 | Control |
| # | Technology | |
|---|---|---|
| #1 | Measuring electric variables | |
| #2 | Special measuring | |
| #3 | Magnets and transformers | |
| #4 | Registering devices | |
| #5 | Transmission systems | |
| #6 | Dynamo-electric machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Angus Donald J | 19 |
| Publication | Filing date | Title |
|---|---|---|
| US2134391A | Reroll drive mechanism for graphic meters | |
| US1948092A | Method and apparatus for producing governed motion at a distance | |
| US1880008A | Graphic meter | |
| US1798394A | Tachometer generator | |
| US1907096A | Recording meter | |
| US1808334A | Volt-ampere meter | |
| US1817432A | Meter | |
| US1601840A | Shunt | |
| US1545078A | Recording meter | |
| US1599268A | Meter | |
| US1539928A | Reactance | |
| US1506552A | Resistance meter | |
| US1415505A | Current transformer | |
| US1425229A | Movable element for meters | |
| US1342081A | Volt-ampere meter | |
| US1342082A | Volt-ampere meter | |
| CA217581A | Volt ampere meter | |
| CA225254A | Volt ampere meter | |
| CA225255A | Volt ampere meter |