Hänvisningar finns i följande patent|
| US4147473 | 3 jan 1977 | 3 apr 1979 | | Method of regulating multistage axial compressor output and an axial compressor for carrying same into effect | | US4464095 | 25 jun 1982 | 7 aug 1984 | | Hydraulic energy converter | | US7059830 | 17 mar 2003 | 13 jun 2006 | Delta Electronics Inc. | Axial-flow serial fan | | US7238004 | 14 apr 2003 | 3 jul 2007 | Delta Electronics, Inc. | Serial fan with a plurality of rotor vanes | | US7740446 | 8 feb 2007 | 22 jun 2010 | Delta Electronics, Inc. | Serial fan with a plurality of rotor vanes | | US7946804 | 31 jul 2007 | 24 maj 2011 | Nidec Corporation | Axial fan unit having reduced noise generation |
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