 |
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| Schreibfederschreiber | |||
| Federschreiber m | |||
| Linienschreiber m | |||
| Meßschreiber m; Registriergerät n | |||
| Tintenschreiber m | |||
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pen recorder : 12 phrases in 4 subjects |
| Communications | 1 |
| Measuring instruments | 2 |
| Optics branch of physics | 7 |
| Sound recording | 2 |
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