For example, U.S. Pat. No. 4,403,722 to Nikolich and U.S. Pat. No. 5,090,606 to Torii et al. disclose internal combustion gas-powered fastener driving tools that areportable and self-contained.Of course, one of the requirements for a fastener driving tool is that it must generate a force that is sufficient to drive a fastener, such as a nail or staple, into the work surface.