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Mercury immersion thermometer with intrical ground glass stopper

1960-1989
Graded interference filter for obtaining near monochromatic light of any colour, by Jenaer Glaswerk, Schott & Gen, Mainz, in fitted case

Graded interference filter for obtaining near monochromatic light of any colour

1945-1989
Two glass alembics with stoppers by Monax

Two glass alembics with stoppers by Monax

1960-1980
Graded interference filter for obtaining near monochromatic light of any colour, by Jenaer Glaswerk, Schott & Gen, Mainz, in fitted case

Graded interference filter for obtaining near monochromatic light of any colour

1945-1989