Non-electric sound-amplifying devices, e.g. non-electric megaphones

Introduced: September 1968

Last revised: January 2006

Full Title

Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general > Non-electric sound-amplifying devices, e.g. non-electric megaphones

Classification Context

Section:: PHYSICS
Class:: MUSICAL INSTRUMENTS; ACOUSTICS
Subclass:: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

Related Keywords

non-electric sound AMPLIFIERSacoustic HORN(S)MEGAPHONESnon-electric MEGAPHONESRESONATORS for non-electric soundTRUMPETS for directive sound transmission