MIL-DTL-62478C(AT)
does not scratch easily. BK 7 glass can be handled without the need for special
precautions. The bubble and inclusion content of BK 7 is extremely low.
b. Fungus inert material. A material which, in all modified states and grades, is not
a nutrient to fungi.
6.4 Subject term (key word) listing.
Cover
Lenses
Mirror
Prism
Seal
Visual anomalies
Window
6.5 Changes from previous issue. Marginal notations are not used in this version to
identify changes with respect to the previous issue due to the extent of the changes.
15
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