Oil impervious acoustical board
On-wall loudspeaker and mounting apparatus
One-piece engine inlet acoustic barrel
Optimized diesel engine exhaust silencer
Optimized loudspeaker transducer monuting system
Optimum edges for speakers and musical instruments
Oscillation absorber for the absorption of structure-borne sound
Outer tube of exhaust system part
Outlet silencer and heat recovery structures for gas turbine
Oval shaped spark arresting muffler for engines
Overhead sound attenuating cover for roadways and railways