Abstract: Speed detectors are provided for detecting speeds of each of the four wheels of a vehicle. An electric circuit is provided to compare the speeds of all wheels and to turn on at least one lamp when a difference between individual wheel speeds is detected, whereby slipping of wheels is indicated.

Abstract: An instructing system for a four-wheel drive vehicle powered by an internal combustion engine comprises a transmission for transmitting power from the engine to two main driving wheels, a clutch for selectively transmitting the power to auxiliary two-wheels, and a select lever for engaging the clutch. Speed detectors are provided for detecting both the speed of the two main driving wheels and the two auxiliary wheels. An electric circuit compares both speeds and turns on a lamp when the difference between both speeds exceeds a predetermined level, whereby slipping of the two main driving wheels is indicated.

Abstract: Seat adjusting mechanism providing a multiplicity of fore-and-aft adjustment positions of a vehicle adjustable seat in which an upper moving guide rail supporting the seat and a lower fixed guide rail comprise two vertical flanges per each rail, the flanges on the upper and lower rails firmly gripping each other thereby preventing the upper rail from being torn off from the lower rail. The mechanism further comprises an improved lock device associated with the flanges on the upper rail.