Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NDC52544-0552-28 found under Norethindrone And E by Watson Labs Inc. The National Stock Number assigned to this part is 6505013853461, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NDC52544-0552-28.