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PL292917A1
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Microscope
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PL270891A1
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Mechanism for vertically displacing optical instruments
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PL250250A2
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School microscope
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PL247894A1
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Tv image enlarging apparatus
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PL247619A1
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Filter head for a photographic enlarger
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PL241780A1
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Microscope focusing mechanism
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PL240652A1
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Mechanism of positioning of slide in projection channel of slide projector
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PL240651A1
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Transport mechanism of magazine in slide projector
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PL237895A1
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Mechanism for adjusting perpendicularity of objective axis relative to slide surface for use in slide projectors
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PL236087A2
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Method of modulating the pulse duration ratio in stabilized transduvers and transducing power packs and circuitry therefor
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PL232073A1
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Petzval portrait lens
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DE2831320A1
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Adjustable holder for mine laser theodolite - has flange with ring mountings on vertical spindle and adjusting and clamping screws
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GB1586652A
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Mechanism for counterbalancing enlarger head in photographic enlargers
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GB1387614A
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Attachment for microscopes
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DE2216395A1
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DEVICE FOR THE AUTOMATIC SIGNALING OF THE METHAL CONTENT IN THE AIR
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GB1339413A
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Positional adjustment mechanism
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GB1355817A
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Interferometer device for detecting methane
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GB1096995A
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Polarizing interferometer microscope
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GB1088837A
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Improvements in or relating to microscopes
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