Birtcher, the home of the original Wedge-Lok ® , designs, and manufactures, COTS, rugged printed circuit board card guides, conduction cooled frames that are designed for circuit borads requiring cooling in severe en......Birtcher, the home of the original Wedge-Lok ® , designs, and manufactures, COTS, rugged printed circuit board card guides, conduction cooled frames that are designed for circuit borads requiring cooling in severe environments, such as VME, CompactPCI ® , PMC applications and extractors for use in non-benign - airborne, shipborne, medical, mobile communications and rugged land-transportation - environments.