| http://www.w3.org/ns/prov#value | - FIG. 1a is a side view showing the internal arrangement of an optical apparatus according to the present invention, FIG. 1b is a front view of the optical apparatus shown in FIG. 1a, and FIG. 1c is an explanatory view showing in detail a mechanism for detecting the elevation angle and depression angle of the optical system of the same optical apparatus;
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