Vibration device
Vibration deviceTechnical BackgroundAging devices for wooden musical instruments are known. For example, a device consists of a hygroscopic, sound
Vibration deviceTechnical BackgroundAging devices for wooden musical instruments are known. For example, a device consists of a hygroscopic, sound
PH METERTechnology backgroundThere are known methods for preventing foreign matter from adhering to an object, and known methods for removing fore
FREELY ADJUSTABLE BOOKSHELFTechnical BackgroundThere is a known device that aligns positions of spines of a plurality of books displayed on a shel