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isa:88290912
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Filters, or lenses, 105 and 109 cover the opening to chamber 97 and are engaged with substantially opaque bridge 111 (made, for example, of aluminum or other substantially non-transparent material capable of blocking light transmission), for isolating the two filters against movement of selected (usually infrared) electromagnetic radiation along the fibers of the filter between the two chambers.
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isap:51041051
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