Obturating Rings (60MM), IAW Drawing 13005177 Revison G, dated March 6, 2014. Purchased for the M930, M983 & M929.Obturating Rings (81MM), IAW Drawing 9310339 Revision AB, dated 24 July 2020. Purchased for the M819.Obturating Rings (120MM), IAW Drawing 12977454 Revision K, dated 10 August 2016. Purchased for the M930, M983 & M929.
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