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- [6] OPACIMETER - INSTRUMENT FOR MEASURING PIGMENT CONCENTRATION JOURNAL OF PAINT TECHNOLOGY, 1971, 43 (560): : 36 - &
- [8] AN INSTRUMENT FOR MEASURING THE CONCENTRATION OF COMBUSTIBLE AIRBORNE MATERIAL ANNALS OF OCCUPATIONAL HYGIENE, 1985, 29 (01): : 81 - 90
- [9] Improved instrument for measuring the air permeability of fabrics JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS, 1942, 28 (05): : 637 - 642
- [10] A portable instrument for measuring air permeability of fabrics BUREAU OF STANDARDS JOURNAL OF RESEARCH, 1931, 6 (01): : 51 - 58