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 ·