|
US4211947A
|
Thickness-shear mode quartz oscillator with an added non-ci… |
Expired / Lapsed
|
1978-02-08 |
1980-07-08 |
24 |
Details
|
|
US4129860A
|
Apparatus for forming a character by a matrix pattern of pi… |
Expired / Lapsed
|
1976-09-13 |
1978-12-12 |
11 |
Details
|
|
US4079367A
|
Apparatus for forming a character out of a pattern of separ… |
Expired / Lapsed
|
1975-12-22 |
1978-03-14 |
19 |
Details
|
|
US3798428A
|
Electronic time-keeping apparatus |
Expired / Lapsed
|
1972-03-20 |
1974-03-19 |
16 |
Details
|