| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 2 | |
| #2 | Germany | 2 | |
| #3 | EPO (European Patent Office) | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | Denmark | 1 | |
| #6 | France | 1 | |
| #7 | Netherlands | 1 | |
| #8 | Norway | 1 | |
| #9 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications | |
| #2 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Transmission systems | |
| #2 | Measuring distances |
| # | Name | Total Patents |
|---|---|---|
| #1 | Cramwinckel J | 2 |
| #2 | Cramwinckel Johannes F | 2 |
| #3 | Maas Johannes | 2 |
| #4 | Cramwinkel Johannes Frederik | 1 |
| #5 | Frederik Cramwinckel Johannes | 1 |
| #6 | Cramwinckel Johannes Frederik | 1 |
| #7 | Van Santen Andries | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1185345A | Apparatus for determining the course angle of a vessel or a vehicle | |
| NL8105610A | Sextant. | |
| GB1206013A | Magnetic slave compass with an alarm device | |
| US3493829A | Magnetic flux valve type data transmission device for remote control of angular positions | |
| CA874097A | Magnetic slave compass with an alarm device |