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Start Over Subjects Optical Devices ✖Remove constraint Subjects: Optical Devices Titles Second partial report on sub-project no. 6-2, study of characteristics and limitations of present visual devices in tanks: sub-project no. 6-4, study of means of improving sighting telescopes ✖Remove constraint Titles: Second partial report on sub-project no. 6-2, study of characteristics and limitations of present visual devices in tanks: sub-project no. 6-4, study of means of improving sighting telescopes Dates by Range 1900-1949 ✖Remove constraint Dates by Range: 1900-1949

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  • Second partial report on sub-project no. 6-2, study of characteristics and limitations of present visual devices in tanks: sub-project no. 6-4, study of means of improving sighting telescopes1