Abstract: A can stacker comprising a square piece or interlocking element of moulded plastic material with circular recesses on both sides to conform to the diameter of the ends of empty beverage cans to be stacked, which cans constitute throw away items. The four edges of the plastic piece are shaped like a square dove-tail, with two adjoining sides male and the other two adjoining sides female so that may interlock horizontally with other interlocking elements in parallel vertical stacks as well as interlocking the ends of vertically stacked cans. Such cans may be used for building numerous useful items, such as coffee tables, bookcases, room divider, etc.

Abstract: A heating core for conducting hot water from the motor of an automobile in close proximity to a windshield and windshield wiper blades so as to heat both continuously so as to prevent accumulation of ice on the windshield wiper blades and minimize accumulation on the windshield. A by-pass valve assembly is provided on the return line from the commonly used heating core and fan housing so as not to deprive the driver and passengers of normal heat developed in such core. The windshield heating core is housed in the housing or receptacle immediately below the windshield in which the wiper blades are normally located.