|
US4303100A
|
Kelly valve |
Expired / Lapsed
|
1978-12-18 |
1981-12-01 |
4 |
Details
|
|
US3273753A
|
Pumping system and leak detection unit control therefor |
Expired / Lapsed
|
1965-03-25 |
1966-09-20 |
2 |
Details
|
|
US3274352A
|
Magnetic card reader |
Expired / Lapsed
|
1964-07-06 |
1966-09-20 |
2 |
Details
|
|
US3252620A
|
Dispensing and metering control |
Expired / Lapsed
|
1964-07-06 |
1966-05-24 |
2 |
Details
|
|
US3250866A
|
Magnetic switching apparatus with adjustable switch positio… |
Expired / Lapsed
|
1963-02-18 |
1966-05-10 |
2 |
Details
|