| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 1 | |
| #2 | Canada | 1 | |
| #3 | Germany | 1 | |
| #4 | Finland | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | Ireland | 1 | |
| #7 | Iceland | 1 | |
| #8 | Netherlands | 1 | |
| #9 | Norway | 1 | |
| #10 | Sweden | 1 | |
| #11 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Control |
| # | Technology | |
|---|---|---|
| #1 | Registering devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Roda Luigi | 4 |
| #2 | Roda L | 2 |
| #3 | Roda Luiga | 1 |
| #4 | Luigi Roda | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1207605A | Improvements in or relating to cards particularly for the control of parked cars | |
| US3528186A | Car parking control cards | |
| IE31889L | Improvements in or relating to cards particularly for the control of parked cars | |
| CA867960A | Car parking control cards |