Mystery and Unidentified Parts

Anybody got any ideas?
Look interesting and have kool stop pads Soooo just had to take them home.
Thanks
 

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For what crankset is this RockRing for? It's for BCD 94 5-bolt, but for a crank that has one bolt behind the crankarm Photo 1. I do not understand, as The Shimano BCD 94 cranks have two bolts near the crankarm (Rockring photo2 from internet)

IMG_3161.webp

1758113961509.webp
 
For what crankset is this RockRing for? It's for BCD 94 5-bolt, but for a crank that has one bolt behind the crankarm Photo 1. I do not understand, as The Shimano BCD 94 cranks have two bolts near the crankarm (Rockring photo2 from internet)

View attachment 1002296

View attachment 1002297
it's for Sugino-produced cranks, e.g. their own Impel etc.
Sugino 1995 I 1.webp
but also stuff they have done for others.

Edit, also the Specialized Strongarm compact 5 arm have that layout, i think some other brands too, maybe all produced by Sugino.
Specialized Strongarm 5arm.webp
 
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