mechanical seals in the nature of shaft seals; single and double mechanical seals with gas or liquid lubrication for sealing liquid or gaseous media; cassette- type mechanical seals; mechanical seals with confining fluid seals; mechanical seals with a flushing function; mechanical seals with leakage recirculation; mechanical seals with leakage control; slide rings being machine parts for pumps, compressors; all the aforesaid goods being parts of machines; mechanical apparatus and devices for ...