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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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1992-09-03
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248 b
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7 lines
(1) a small telescope attached to a larger
optical instrument to fix its line of sight;
(2) an optical device for producing a
nondivergent beam of light; (3) any device
for limiting the size and angle of spread of
a beam of radiation or particles.