70's disc brake from tandem

big.eck":2jgt5289 said:
http://cgi.ebay.co.uk/Early-Shimano-Disc-brake-tandem-complete-working-/120622111172?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item1c15a359c4

wonder how the disc mounts to the hub :?

flip flop hub? and it looks 1980's - 1970's Shimano was hydraulic and had fins like a small moped engine block
 
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did they have them back then ? and what would stop the disc from spinning when braking ?
 
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