Referenced by|
| US4896632 | 10 Oct 1985 | 30 Jan 1990 | | Unsymmetrical free piston engine | | US6945202 | 1 Nov 2004 | 20 Sep 2005 | Denso Corporation | Free piston engine and power generation system therewith | | US7159544 | 6 Oct 2005 | 9 Jan 2007 | | Internal combustion engine with variable displacement pistons |
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