Abstract: This modular element has several conduits disposed side by side, each pair of adjacent conduits being interconnected to form a rigid or flexible unit, each conduit has a male end and an opposite female end, the latter for joining with the male end of an aligned conduit of an adjacent modular element. The several conduits of a first modular element can therefore be simultaneously extended by the several conduits of a second modular element by simultaneously joining the female and male ends of the elements. These elements can be in the form of panels to be joined together to form, for instance, a solar panel or a floor covering with a circulating heat transfer fluid through the conduits. The conduits may also serve as protected passages for underground electrical wires. The conduits may be provided with sprinkler holes to water plants.

Abstract: A skate sharpener having a cylindrical sharpening member held between two symmetrical members forming a holder. A radical slot is provided in the holder for receiving a skate blade to be sharpened by the sharpening member. The width of the slot can be varied to snugly receive skate blades of different width. The sharpening member is centrally retained in the holder, relative to the slot, regardless of the width of the slot.