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Instructions for Cleaning the Lenses in the British Refracting Unit
ARCHIVAL ITEMS
instruction leaflet
Europe: United Kingdom
1930s
paper
overall: 260 x 208 mm

Typewritten sheet describing order in which to clean lenses of the BRU so as to ensure that each individual lens is treated.


2004.623

Gift of A. H. Rivron & Son Ltd, 2004



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