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| Number | Title | Issue Date |
| 5101799 | Mixture control unit for use with the control system of a soil venting apparatus The invention provides a mixture control system for controlling the flow of vaporized hydrocarbons drawn into an engine for combustion and combining a supplemental fuel with the vaporized hydrocarbons as required to maintain a near stoichiometric mixture.... | 04/07/1992 |
| 5070850 | Mixture control unit system for soil venting apparatus The invention provides a mixture control system for controlling the flow of vaporized hydrocarbons drawn into an engine for combustion and combining a supplemental fuel with the vaporized hydrocarbons as required to maintain a near stoichiometric mixture.... | 12/10/1991 |
