Surgical osteosynthesis composite material, which is self-reinforced i.e. it is formed about the absorbable polymer or copolymer matrix which is reinforced with the absorbable reinforcement units which have the same chemical element percentage composition as the matrix has.

Preceramic polymers which have particular utility in providing protective ceramic coatings on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials are prepared by reacting 0.25-20 parts by weight of a trialkyl-, trialkoxy-, or triaryloxyboroxine in which any alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a polysilazane to form an organob...

The machine consists of a body (2) of a synthetic material, mounted on wheels (6) and carrying an electric motor (1). The wheels are equipped with a height adjustment mechanism which is enclosed inside a rectangular box-shaped housing (3) which acts as a reinforcing rib along the side of the body. The mechanism is actuated by a press-button (4) recessed into the body of the machine, and the oppos...