| 21. | Measurement of airborne noise emitted by machines ; enveloping surface method ; metal working machines , drilling machines
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| 22. | Measurement of airborne noise emitted by machines ; enveloping surface method ; woodworking machines sanding machines
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| 23. | Measurement of airborne noise emitted by machines ; enveloping surface method ; woodworking machines ; routing machines
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| 24. | Measurement of airborne noise emitted by machines ; enveloping surface method , woodworking machines , planing machines
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| 25. | Measurement of noise emitted by machines ; airborne noise emission ; enveloping surface method ; surface treatment plants
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| 26. | Measurement of airborne noise emitted by machines ; enveloping surface method ; metal working machines grinding machines
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| 27. | Measurement of noise emitted by machines ; airborne noise emission , enveloping surface method ; internal combustion engines
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| 28. | Measurement of noise emitted by machines - airborne noise emission enveloping surface method - part 23 : gear transmisson
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| 29. | Measurement of airborne noise emitted by machines ; enveloping surface method ; surface treatment plant ; measurement example
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| 30. | Measurement of airborne noise emitted by machines ; enveloping surface method ; still picture and motion - picture projectors
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