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Riordan Manufacturing Pt 1 Essay Preview: Riordan Manufacturing Pt 1 Report this essay Riordan Manufacturing Pt 1 Riordan Manufacturing, Inc is a leader in the field of plastic injection molding. Riordan Manufacturing employs 550 people and growth is expected. It has plants in San Jose, California, Albany, Georgia, Pontiac, Michigan, and Hangzhou, China. Riordan Manufacturing.