Hänvisningar finns i följande patent|
| US3977815 | 24 apr 1974 | 31 aug 1976 | | Portable apparatus for compressing gases such as air | | US4923368 | 20 jun 1989 | 8 maj 1990 | Martin Research & Development Ltd. | Liquid driven turbine | | US5857480 | 26 sep 1997 | 12 jan 1999 | | Water purging system |
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