Packet of conical large chemical filter papers made by Carl Schleicher & Schull, Duren c.1900. Packet of conical large chemical filter papers made by Carl Schleicher & Schull circa 1900
"Whatman" No.540 filter paper, 12.5cm, boxed, by W & R Balston Ltd, England "Whatman" No.540 filter paper
"Whatman" No.40 filter paper, 12.5cm dia, boxed, by W & R Balston, England "Whatman" No.40 filter paper
"Whatman" No.50 filter paper, 7cm dia, 2 boxes, by W & R Balston Ltd, England "Whatman" No.50 filter paper
Nine packets of small circular filter papers and numerous loose filter papers in non-original box made by J. H. Munktells and Schleicher & Schull, c.1900 Nine packets of small circular filter papers and numerous loose filter papers in non-original box circa 1900; circa 1900
Packet of conical large chemical filter papers made by Carl Schleicher & Schull, Duren c.1900. Packet of conical large chemical filter papers made by Carl Schleicher & Schull circa 1900
Box of 'Sterimat' chemical filter papers made by Ford Ltd, High Wycombe c.1900. Box of 'Sterimat' chemical filter papers made by Ford Ltd circa 1900
Selection of 3 air pump filters, paper(?), 2 sizes, (15, 32mm), unsigned, supplied by SKC Ltd, Blandford Forum, Dorset, England, 1996-1999 Filter samples, British, 1996-1999 1996-1999