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
  • Size in cm: 16,7 x 10 x 0,3
  • Condition: very good
  • Donor: Univ. Prof. Dr. Robert Snowden