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GB782422A
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Photomicrographic device
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DE934128C
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Refractive or reflective optical device with variable focal effect
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GB731218A
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Photoelectric photometric measuring instrument
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GB718468A
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Improvements in light dividing optical systems
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DE921415C
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Penumbral polarimeter
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DE947650C
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Mirror system
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DE735448C
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Device for measuring a length with a movable measuring element acting on a counter
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GB378712A
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Improvements in optical doubly-refracting devices
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DE550719C
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Rotatable compensator with a plane-parallel plate made of birefringent material
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DE467150C
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Microscope for meat inspection or similar purposes
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DE452041C
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Device for setting and reading the intermediate values on divisions with unequal intervals
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DE436735C
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Revolver for optical observation devices
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DE399667C
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Analyzer prism for microscopes
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DE349343C
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Filter device
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DE349295C
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Polarizing microscope with tube analyzer designed for conoscopic use
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DE351704C
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Filter device
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