new photos of cylinders for nitrogen, an argon, carbon-dioxides, ammonia, a compressed air, helium are added. The exposition of a technical data engraved on a neck of a cylinder is added.

A site in a stage of filling. Excuse for inconveniences. Up to the end of January 2008 there will be an expanded information on cylinders for prosir, cylinder valves, regulators, accessories for cylinders.