Prehistoric technology Ground and polished stone tools continued to be created and used during the Neolithic period. Numeric record keeping evolved from a system of counting using small clay tokens that began in Sumer about 8000 BC. The Stone Age developed into the Bronze Age after the Neolithic Revolution. The Neolithic Revolution involved radical changes in agricultural technology which included development of agriculture, animal domestication, and the adoption of permanent settlements. The Bronze Age is characterised by metal smelting of copper and its alloy bronze, an alloy of tin and copper, to create implements and weapons. Polished stone tools continued to be
Antimicrobial copper-alloy touch surfaces products in accordance with the U.S. E.P.A registrations. Products offered by the approved companies include sinks, computer keyboards, faucets, IV poles, tables, stretcher rails, railings, hampers, decorative and architectural hardware (levers, grips, knobs, pulls, towel bars, grab bars, kick plates, bath accessories, outlet covers, light switch covers), laboratory incubators, cabinet hardware, decorative tile, and free weights. The U.S. E.P.A. oversees a stewardship plan to promote the responsible use of Antimicrobial Copper. Further information about the making accurate claims about Antimicrobial Copper is also available. Many antimicrobial copper alloy products have been approved for registration in healthcare facilities, public and commercial