| 4822327 |
Jacket for a flexible magnetic disk and production of the jacket |
Bernhard Lenz, Kurt Zwintzscher, Dietrich Gruehn, Norbert Holl |
1989-04-18 |
| 4796137 |
Protective jacket for a disk-shaped recording medium |
Dietrich Gruehn, Joachim Hack, Peter Rudolf, Norbert Holl |
1989-01-03 |
| 4755901 |
Protective jacket for a disk-shaped recording medium |
Werner Fehrenbach, Dietrich Gruehn, Kurt Zwintzscher |
1988-07-05 |
| 4688129 |
Protective jacket for a disk-shaped recording medium |
Dietrich Gruehn, Norbert Holl |
1987-08-18 |
| 4671145 |
Method and apparatus for the surface machining of substrate plates for magnetic memory plates |
Volker Koch, Bernhard Boese |
1987-06-09 |
| 4347091 |
Apparatus for the production of jackets for recording disks |
Karl P. Hauck, Dieter Mayer, Herbert Wagner, Kurt Zwintzscher |
1982-08-31 |
