EBKO
								OVERHEAD AND UNDERGROUND COAXIAL-TYPE PIPING SYSTEMS FOR CONVERTING STEAM, WATER, OIL AND CHEMICALS COMPRISING LENGTHS OF PIPE, INNER AND OUTER LENGTHS OF PIPE, INSULATED LENGTHS OF PIPE, AND SPLIT-TYPE PIPE FITTINGS FOR INTERCONNECTING LENGTHS OF OUTER PIPE
                                Expired  ·  May 28, 1971  ·  72393457  ·