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| 100 | 1 | _aBlackman, Michael | |
| 245 | 0 | 0 |
_aPatent Information : _ban Historical Perspective |
| 650 |
_aPatentdokumentation _93575 |
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| 650 |
_aTechnikgeschichte _94361 |
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_aWPI. 16(1994),4,223-232. _wz_WPI |
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_c3447 _d3447 |
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