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Not that it answers your question, but in the 1960's, Alpine Gearing referred to having a large tooth difference between the front chainrings. What this did was give you some very low gears and some nice high ones too, but with the derailleur systems of the day it meant that you couldn't cross chain (big ring-little cog, little ring big cog) without either breaking something or having the chain loose and hanging down.
 
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