|
US2141655A
|
Radiation sensitive device |
Expired / Lapsed
|
1933-12-16 |
1938-12-27 |
0 |
Details
|
|
US2081041A
|
Apparatus for measuring radiation |
Expired / Lapsed
|
1934-08-23 |
1937-05-18 |
0 |
Details
|
|
US2047638A
|
Humidity measuring device |
Expired / Lapsed
|
1934-09-01 |
1936-07-14 |
0 |
Details
|