Mechanical seals, namely, shaft seals; single acting and double-acting mechanical seals with gas or liquid lubrication for sealing liquid or gaseous media; box-type mechanical seals; [ mechanical seals with sealing fluid water seals; mechanical seals with rinse functions; mechanical seals with leak recovery mechanisms; ] mechanical seals with leak checking mechanisms; all the aforesaid goods being machine parts [ ; mechanical apparatus and equipment for the storage, pressurization, circulatio...