on equipment, especially for ground aircraft trainers and the like* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS3278752 *Jun 17, 1963Oct 11, 1966Berlyn B BrixnerWide angle optical system having a telecentric stop and an interference filterUS3504122 *Mar 16, 1965Mar 31, 1970Ratliff Harvey L JrStereoscopic television systems with means to control the camera