4.6.3 Eyepiece.
The eyepiece for the telescope or periscope that is usable from a seated position for viewing each point of interest shall be positioned 43 inches (1090 mm) minimum and 51 inches (1295 mm) maximum above the floor or ground surface.
The eyepiece for the telescope or periscope that is usable from a seated position for viewing each point of interest shall be positioned 43 inches (1090 mm) minimum and 51 inches (1295 mm) maximum above the floor or ground surface.
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