A combustion-type power tool including a housing, a combustion chamber provided in the housing, an ignition plug exposed to the combustion chamber, a cleaning passage communicatable with the combustion chamber, and a shut-off unit provided in the cleaning passage....http://www.google.es/patents/US7261071?utm_source=gb-gplus-sharePatente US7261071 - Combustion type power tool facilitating cleaning to internal cleaning target
Combustion type power tool facilitating cleaning to internal cleaning target
