IC 009. US 021 023 026 036 038. G & S: Pressure indicator plugs for valves, namely, pressure indicator plugs for compressed gas injection valves; pressure indicators, namely, pressure indicators for use with compressed gas injection valves; pressure measuring apparatus, namely, pressure measuring apparatus for compressed gas injection valves; automatic indicators of low and/or high pressure of gas; pressure control apparatus for compressed gas injection valves; detectors of low and/or high pressure of gas; pressure indicators for compressed gas injection valves
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