| INPADOC Patent Family US3843021 |
| Publication No. | Publication date | Filing No. | Priority | Links |
| CA 957338A1 | 19741105 | CA 159288A 00000000 | US 29427172A 19721002 | Espacenet |
| US 3843021A | 19741022 | US 29427172A 19721002 | US 29427172A 19721002 | National register (PAIR) |