Abstract: A lightweight propulsion device for use with various types of lightweight boats and other small craft, including use with a swimmer is provided with a frame for mounting the propulsion device on the craft. A shaft rotatably supported on the frame carries a propeller, including flexible blades rotatably supported relative to the shaft on a hub. The blades are supported for rotation about an axis having a major radial component and stop means supported relative to the shaft limits movement of each blade in each direction from a plane through the shaft axis. A pair of cables are coupled to the shaft to turn the shaft and are positioned to be wrapped around the shaft in opposite directions. Sheaves on the shaft for each cable contain and direct the cables as they are alternately wrapped and unwrapped around the shaft.

Abstract: A frame attachable to the numbering shaft of a conventional printing press supports and guides belts bearing print elements side-by-side across a printing head such that the belt paths define parallel columns and drive and indexing means position the belts such that print elements fall in selected rows to define at least one predetermined code pattern which prints a machine readable code.