A gun that fires a missile, powered by gas "discharged by the operator of the toy."
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| Number | Title | Issue Date |
| 5558686 | Method for making a fuel product Methods for producing a combustible fuel product from a biological sludge are provided. A removable bulking agent is mixed with the sludge and the mixture aerobically composted under conditions effective to substantially reduce the level of pathogenic mic... | 09/24/1996 |