| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 4 | |
| #2 | United Kingdom | 4 | |
| #3 | Switzerland | 3 | |
| #4 | Germany | 1 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Measuring volume | |
| #2 | Measuring speed and acceleration | |
| #3 | Measuring electric variables | |
| #4 | Parachutes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Jan Antoon Bartelink | 2 |
| #2 | Wynia Sipke | 1 |
| #3 | Antoon Bartelink Jan | 1 |
| #4 | Nationaal Luchtvaartlaboratori | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB746195A | Improved electronic frequency meter | |
| GB746191A | Improvements in and relating to electric circuits for measuring rotation speeds and/or for totalising revolutions | |
| GB746190A | Improvements in or relating to flowmeters | |
| US2790145A | Electric circuit for metering the flow of a liquid or gaseous medium | |
| GB660799A | Flowmeter |