PITTSBURGH--(BUSINESS WIRE)--Grey Mountain Partners, LLC (“GMP”) has made a majority equity investment in Bolttech Mannings, LLC (“Bolttech Mannings”), a provider of technical bolting and heat treating services and products for industrial applications. The investment provides Bolttech Mannings with additional capital and resources to enable it to continue providing the highest quality service and innovative products to its customers, and to further expand its business thr
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