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Filter paper, Grade number 6
Filter paper, Grade number 6
Filter paper, Grade number 6
Filter paper, Grade number 6
Filter paper, Grade number 6
Filter paper, Grade number 6
Quantitative filter paper, Grade 391 - blue spot, circles
Filter paper, Grade 392, red spot, quantitative, circles
Quantitative filter paper, Grade 391 - blue spot, circles
Filter paper, quantitative, Grade 388 - black spot, circles
Filter paper, quantitative, Grade 388 - black spot, circles
Filter paper, Grade 392, red spot, quantitative, circles
Quantitative filter paper, Grade 391 - blue spot, circles
Filter paper, Grade 392, red spot, quantitative, circles
Filter paper, qualitative, type MN 612 1/4, filter circles
Filter paper, qualitative, type MN 612 1/4, filter circles