US Army, Technical Manual, TM 55-4920-437-13&P, PROPELLER/ROT SHOP, PART NO. SC-4920-99-CL-A67, (NSN 4920-01-139-4546),

US Army, Technical Manual, TM 55-4920-437-13&P, PROPELLER/ROT SHOP, PART NO. SC-4920-99-CL-A67, (NSN 4920-01-139-4546),

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