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BS PD ISO/TS 19425:2015

Reciprocating internal combustion engines. Measurement method for air cleaners. Sound power level of combustion air inlet noise and insertion loss using sound pressure
standard by BSI Group, 12/31/2015

BS PD ISO/TR 21477:2017

Optics and photonics. Preparation of drawings for optical elements and systems. Surface imperfection specification and measurement systems
standard by BSI Group, 09/27/2017