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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Kimmo
@gbj_tester
Found the description:
Cincinnati Bickford radial drill shown drilling shaft collars in large Series 7000 wheel to be used for pelletizing of Taconite ore. The multitude of bolts seen in the radial blades are holding in place thin renewable wear blades for this abrasive job
From http://www.sturtevantfan.com/BldgD.html