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Umkehrsystem n
industr., construct.	erecting eyepiece
mater.sc., el.	system of rotation
opt.	erecting system (optical relay used in visual instruments for changing the orientation of the image so that the observer sees it in its proper attitude, i. e. right-handed and erect); inverting system (optical relay used in visual instruments for changing the orientation of the image so that the observer sees it in its proper attitude, i. e. right-handed and erect)
phys.	erecting system; image-erecting system; inversion system

Umkehrsystem: 4 phrases in 2 subjects

Cultural studies	2
Physics	2