Abstract: The environment of the invention comprises work degreasing apparatus wherein a tank contains liquid solvent to be vaporized by a heater for degreasing contact with work introduced into the tank, the vapor being subject to condensation, there also being a tank cover having open and closed positions. The inventive improvement comprises means responsive to closing of the cover to control the heater to reduce heat transfer to the liquid solvent, and also responsive to opening of the cover to control the heater to increase heat transfer to the liquid solvent.

Abstract: A noise suppressor package attachable to air exhaust tubing comprises:A. annular body means defining an axially extending bore to pass said exhaust, said body means including compressible foam segments which project radially inwardly at said bore, said segments being axially elongated and circularly spaced, andB. a tubular cover extending about said body means and having a flexible neck at one end of said body means, said neck being radially constrictable about said exhaust tubing to retain the package to the tubing.