Abstract: A piston-type internal combustion engine is formed of a high performance synthetic resin material. The cylinders and pistons have an octagonal profile. Two or three rows of pin roller bearings are positioned in transverse semi-cylindrical grooves formed on the cylinder walls, to afford smooth, low-friction rolling contact and to seal the compression from leaking around the piston. There are angle support pieces fitted within the annular channels at respective vertices or corners, and are adapted for rotationally supporting the ends of adjacent pin roller bearings.

Abstract: A piston-type internal combustion engine is formed of a high performance synthetic resin material. The cylinders and pistons have an octagonal profile. Two or three rows of pin roller bearings are positioned in transverse semi-cylindrical grooves formed on the cylinder walls, to afford smooth, low-friction rolling contact and to seal the compression from leaking around the piston. There are angle support pieces fitted within the annular channels at respective vertices or corners, and are adapted for rotationally supporting the ends of adjacent pin roller bearings.

Abstract: A process for updating the frame check sequence FCS.sub.r (X) of a digital frame including an embedded variable header polynomial H.sub.r (x), said process including: partitioning H.sub.r (x); XORing the modified polynomial header H.sub.t (x) and previous polynomial header H.sub.r (x) to generate a differential polynomial D(x); computing a differential frame check polynomial sequence dFCS (x) on said D(x) only and adding dFCS (x) to the polynomial FCS.sub.r (x) to form a new FCS.sub.t (x).

Abstract: A data handling system wherein data are arranged into frames including an information data section and a frame check sequence (FCS) section, and wherein a stamp section has to be appended/deleted from said frame. The stamp appending is operated without any FCS updating being required by appending to each stamp, a so called precomputed and stored anti-stamp.