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| Alphabetical [« »] investigated 1 investigation 1 investigations 2 invisible 2 iron 9 is 286 issue 1 | Frequency [« »] 2 introduced 2 introductory 2 investigations 2 invisible 2 kinds 2 knowledge 2 labourer | Hermann Ludwig Ferdinand von Helmholtz On the Conservation of Force IntraText - Concordances invisible |
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1 I | are on the verge of the invisible, all these acquire the force 2 III| is a motion, an internal invisible motion of the smallest elementary