Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 101
Fig 92 -No. 3210, Standard London Microscope, with plain tubularBubstage and dust-tight double noaepiece. r, 97 … T^a q?—No 3211, Standard London Microscope, with screwiocLing B^S-out substage, dust-tight double nosepieoe. 98
Microscopy
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