Eyepieces on viewing scopes shall be 43 inches (1090 mm) minimum and 51 inches (1295 mm) maximum above the ground....
Search Results "Viewing Scope"
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1011.8 Viewing Scopes
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Outdoor Constructed Features Within Viewing Areas [F246.3]
At least 20 percent, but no less than one, of each type of outdoor constructed feature provided within each viewing area must comply with the applicable technical requirements for the feature...