|
US4527275A
|
Correlation data communications system |
Expired / Lapsed
|
1982-06-21 |
1985-07-02 |
23 |
Details
|
|
US4477912A
|
Correlation data communications system |
Expired / Lapsed
|
1982-02-12 |
1984-10-16 |
37 |
Details
|
|
US4128835A
|
Method and apparatus for measuring distance between an airc… |
Expired / Lapsed
|
1978-02-02 |
1978-12-05 |
25 |
Details
|
|
US3088070A
|
Frequency correcting communication system and method |
Expired / Lapsed
|
1959-05-13 |
1963-04-30 |
1 |
Details
|