The last photo of Carl Zeiss Jena 31.5x7.5mm upper spacer ring GF-Pw 10x (25) microscope eyepiece - Mikroskopteil
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Carl Zeiss Jena 31.5x7.5mm upper spacer ring GF-Pw 10x (25) microscope eyepiece
(Carl Zeiss Jena 31.5x7.5mm upper spacer ring GF-Pw 10x (25) microscope eyepiece)