The New Design Guide from Fey describes their full range of labyrinth sealing rings that reduce bearing failure in dirty and abrasive conditions. Their non-contacting surfaces mean low friction and low wear in rotating applications. Available in sizes up to 1300mm shaft diameter in standard and in special materials suitable for temperatures up to 750°C. The free guide is available in A4, A5 or CD format.
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Poll: Should the UK’s railways be renationalised?
I'd hate to be disingenuous so I've replotted the data with the first trendline from 1946 to 1977 and the second using your chosen dates 1983 to 2018....