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| 100 | 1 | _aAspden, H. | |
| 245 | 0 | 0 | _aPatent Statistics as a measure of technological vitality |
| 650 |
_aPatentwesen _93556 |
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| 650 |
_aStatistik _94239 |
||
| 773 | 0 |
_aWPI. 5(1983),3,170-173. _wz_WPI |
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| 999 |
_c4494 _d4494 |
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