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English: Protective cover of the overhead mirror of a Janus epidiascope manufactured by German optics company Ed. Liesegang oHG, Duesseldorf, around 1910. The text reads: "Caution with silver mirror! The silvered mirror at the front must not be toughed by hand. Remove dust if at any means possible by blowing off; if necessary use a very find brush exercising utmost care."
|Date||14 April 2010|
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