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Yusei, Spira and Ota Rings

2 Yusei rings with and without a metal ring in the middle, 2 Ota rings made of nylon in sizes medium and small, 1 Spira ring, also from the inventor of the Ota ring, Dr. Tenrei Ota. Mounted on black cardboard.

Inventory number: 1867
Material: polyethylen, metal, cardboard
Dimensions, in cm: 16,7 x 10 x 0,3
Condition: very good
Donor: Robert Snowden