3.2002.2144.1: Industrial Problems, Prevention of Accidents: Germany. Safety Devices in Various Manufacturing Plants: Gesellschaft des ächten Naxos-Schmirgels Naxos-Union. Schmirgel-Dampfwerk Frankfurt a. M., Julius Pfungst, Frankfurt a. M.: Energy grinding machine with safety cap and dust suction contrivance "Naxos" Union Company.