Abstract: Eight and ten sided irregular polyhedron building structures which are particularly well suited to be manufactured on an automated continuous production and manufacturing line. Both building structures are manufactured from planar building panels each having a uniform width. The panels are further designed having face angles such that during manufacture a single top or bottom edge cut results in forming two edges, one on the preceding panel and one on the subsequent panel.

Abstract: A machine for clipping strip material including a blade operated in a cyclic manner having a cutting stroke and a return stroke. A toggle linkage including a toggle bar effecting one blade cycle by moving in a lengthwise direction with the blade being reciprocated by toggle linkages moving through an upright position to a position oppositely inclined to their starting position. The toggle bar is coupled to an actuating piston rod of a pneumatic cylinder. End caps of the cylinder are recessed to receive piston extensions during final stages of piston travel for cushioning purposes. Seal means engage each piston extension during the later stage of piston travel to trap air between the advancing piston and the end cap. Accordingly, blade and toggle assembly inertia is dissipated in the compression of trapped cylinder air. Exhaust means within each of said end caps is valve controlled to release cylinder pressure at a desired pressure braking the latter stages of piston travel.