|
US3294958A
|
Analog-to-digital converter |
Expired / Lapsed
|
1962-07-13 |
1966-12-27 |
2 |
Details
|
|
US3247491A
|
Synchronizing pulse generator |
Expired / Lapsed
|
1962-09-27 |
1966-04-19 |
2 |
Details
|
|
US3166636A
|
Data composer |
Expired / Lapsed
|
1960-12-30 |
1965-01-19 |
2 |
Details
|
|
US3131376A
|
Security-line-surveillance system |
Expired / Lapsed
|
1961-03-01 |
1964-04-28 |
2 |
Details
|