Sone 303 Eng -

: A portable electronic keyboard for which Yamaha provides a and support in English. 303 Fear Faith Revenge

Industrial workshops use dust collectors containing 303-grade stainless steel internal components. The "Eng" part refers to the engineering blueprint for the acoustic baffle system designed to keep noise below 4 Sones for OSHA compliance. sone 303 eng

If “303 eng” refers to a (e.g., a computer fan, vacuum cleaner, or ventilation unit), then 303 could be the airflow or pressure spec, and eng the engineering version. : A portable electronic keyboard for which Yamaha