Cornerstone acquired Eastern Vault Company, Inc. in 2015. Established in 1970 in Princeton, West Virginia, Eastern Vault  is a leading manufacturer of highly engineered, precast, prestressed and concrete block products. More specifically, the Company’s broad portfolio of concrete products encompasses highly-engineered prestressed concrete beams used in bridge construction and precast manholes, box culverts, vaults, open topped drains and various other precast products for all types of construction, utility and other “mission critical” projects.