One workhorse of the ETA mechanical line is the ETA 2824-2, The 2824 is an automatic winding, twenty-five jewel movement, available in four executions or grades: Standard, Elaborated (improved), Top and Chronometer.
The Breather Valve is a protection device mounted on a nozzle opening on the top of a fixed roof atmospheric storage tank. Its primary purpose is to protect the tank against rupturing or imploding.
spacer (plural spacers) ( 1 sometimes science fiction) A person who works or lives in space. 2  An object inserted to hold a space open in a row of items, e.g. beads or printed type. 3  A bushing. ( slang) A forgetful 1  person. (medicine) A type of add-on device used by an asthmatic person to increase the effectiveness of a metered-dose inhaler.