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- Q5339572 subject Q10102489.
- Q5339572 subject Q7040443.
- Q5339572 subject Q8077342.
- Q5339572 abstract "Edmund Hugh Hodgkinson was a British bicycle inventor who in 1896 patented the Gradient three-speed gear changing system, one of the very earliest proposals for a derailleur. The patent application in 1896 (patent 1570), described a system in which For the purpose of altering the speed of the gearing two or more pinions of different sizes are provided and arrangements made for shifting the driving chain from pinion to pinion.("pinion" = "sprocket" in modern terms)The Gradient system based on these ideas was introduced commercially in 1900.".
- Q5339572 wikiPageWikiLink Q10102489.
- Q5339572 wikiPageWikiLink Q1154740.
- Q5339572 wikiPageWikiLink Q1156860.
- Q5339572 wikiPageWikiLink Q142.
- Q5339572 wikiPageWikiLink Q145.
- Q5339572 wikiPageWikiLink Q7003.
- Q5339572 wikiPageWikiLink Q7040443.
- Q5339572 wikiPageWikiLink Q8077342.
- Q5339572 comment "Edmund Hugh Hodgkinson was a British bicycle inventor who in 1896 patented the Gradient three-speed gear changing system, one of the very earliest proposals for a derailleur.".
- Q5339572 label "Edmund Hugh Hodgkinson".