FORMAN, District Judge.
This is a suit for infringement of letters patent No. 1,821,902, covering a manometer for the measurement of pressure or vacua in fluids, or of differences in pressure or in vacua between several points in fluid systems. More particularly the invention relates to an improvement in so-called sphygmomanometers, or apparatus for the indirect determination of blood pressure. The parties hereto say that the instrument in suit, the mercurial gravity...
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