The advent of e-commerce has prompted many manufacturers to redesign their traditional channel structure by engaging in direct sales. In this paper. we present a dual channel inventory model based on queuing theory in a manufacturer-retailer supply chain. consisting of a traditional retail channel and a direct channel which stocks are kept in both upper and lower echelon. https://www.wingdress.com/product-category/nipple-clamps/
Nipple Clamps
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