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1 result for “page 2 of 7” · 2119ms

Patent

US4002421 Control of vertical heat treating vessels

Cited prior art · James R. Summer · ROUND ROCK LIME Co · United States · 1977

with four-way valve 102 in its first position, valve port sure transmitter 72 via line 76. Pressure sensor 78 is 134 communicates with valve port 136 and valve port positioned at