Can someone explain these things please ?
I'll give this my best shot: A safer, more efficient, and quieter air mover for room use You're looking for something that will move air into or out of a roomAn simple example would be a fan in a windowA rain-sensitive house window (whats this??) Maybe a window that closes itself? I'm not very sureA built-in auto refrigerator (auto? built in what?) I would imagine autocarSo a refrigerator for a carShield to prevent corn spillage where the drag line dumps into the sheller elevator[angle varies] A sheller elevator would hold corn before going into a shellerOther then that I'm not going to be able to help you with this oneAn automatic tractor-trailer-hitch aligning device A tractor-trailer has two partsNamely a tractor (the part with the engine) and a trailer (the big boxy part with all the cargo)They're looking for something that would automatically drive the tractor part until it was in the proper position for the trailer to be lowered onto itA windshield deicer Something that would remove ice from a windshield(Car windshield? Airplane windshield? The question doesn't really sayRight now this is normally done by spraying the windshield with deicing chemicalsA collector for dust(smoke) particles from stacks Something that would collect the soot from a factory (or anything that was making smoke)This is probably going to be some sort of filter.