| http://www.w3.org/ns/prov#value | - The projection apparatus according to claim 4 , wherein said at least one positive lens element and said at least one negative lens element in each of said first-group cemented lens and said second-group cemented lens are a single positive lens element and a single negative lens element, respectively; said first-group lens system further comprises a first-group lens element between said first-grou
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