Elastomer rubber gaskets sold in sets for sealing plate heat exchangers of various types and manufacturers

Computer software for the transmission of digital signals over a twisted pair shielded cable or a fiber optic cable system and the development of multi-protocol wide area network products, namely, bridges, routers, frame relay access devices, packet assemblers and disassemblers, multiplexers and special communication servers for use in the field of telecommunications, rail trafficking and aviation traffic control