Filter paper, qualitative

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Qualitative filter paper, Grade 1573½, folded filters

Qualitative filter paper, Grade 1573½, folded filters

Qualitative filter paper, Grade 1573½, folded filters

Qualitative filter paper, Grade 1573½, folded filters

Qualitative filter paper, Grade 593 ½, folded filters

Qualitative filter paper, Grade 593 ½, folded filters

Qualitative filter paper, Grade 594½, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595 1/2, folded filters

Qualitative filter paper, Grade 595, circles

Qualitative filter paper, Grade 595, circles