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New ![ISO 9921-1:1996 [ Withdrawn ]](https://www.pdfplace.org/39851-large_default/iso-9921-1-1996-withdrawn-21.jpg "ISO 9921-1:1996 [ Withdrawn ]")
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View larger ![ISO 9921-1:1996 [ Withdrawn ]](https://www.pdfplace.org/39851-thickbox_default/iso-9921-1-1996-withdrawn-21.jpg "ISO 9921-1:1996 [ Withdrawn ]")
ISO 9921-1:1996 [ Withdrawn ]
M00005302
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ISO 9921-1:1996 Ergonomic assessment of speech communication - Part 1: Speech interference level and communication distances for persons with normal hearing capacity in direct communication (SIL method)
standard by International Organization for Standardization, 11/01/1996
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