A method and system reduce interference between overlapping first and second wireless LAN cells in a medium. A drive apparatus for a hybrid vehicle is configured in such a manner that a torque limiter is provided in the path of power transmission between an inner shaft and a generator at a position between the generator and a motor. For example, a GaAs-based HBT is formed by successively stacking a subcollector layer made of n+-GaAs, a collector layer made of n\u2212-GaAs, a base layer made of p+-GaAsBi, an emitter layer made of n-InGaP, a first cap layer made of n-GaAs, and a second cap layer made of n+-InGaAs on a substrate 1 made of single crystal GaAs. Attachment means is provided for attaching the spray nozzle to the syringe at the time of the delivery of the liquid substance to the nasal passage. The interface supports a multizone system having a primary zone and one or more secondary zones. The tool mount and tool cooperate to provide the hand tool with a variable angle of attack with an enhanced power ratio for accommodating aged, arthritic and otherwise handicapped people.