| http://www.w3.org/ns/prov#value | - This 15 second job can open up the outdoors in ways you never imagined!The 40xr and 100xr objectives are retractable, i.e. spring-loaded, to protect your lenses and slides should they come in contact. (The r in xr means retractable.)The Observer is nothing less than a wonderful instrument, built for a lifetime of use, and well worth the extra investment.
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