Qualitative Activated carbon filters, 508, round filters

Qualitative filter paper, Grade 1573½, folded filters

Qualitative filter paper, Grade 2294, circles

Qualitative filter paper, Grade 2294, circles, with central hole

Qualitative Filter Paper, Grade 2555 1/2, qualitative

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, circles