| All Patents in class 346/4 |
Patents 1 -
15
of 58
      |
| Number | Date | Patentee | Title | Type |
| 41,182 | Jan. 05, 1864 | W.B. Le Van, S.L. Wiegand | Steam Engine Indicator | steam engine indicators |
| 265,198 | Sep. 26, 1882 | J.B. Webb | Diagram Instrument for Engines | steam engine indicators |
| 334,778 | Jan. 26, 1886 | H.R. Illingworth, J.J. Illingworth | Steam Engine Recorder | industrial recording apparatus |
| 334,779 | Jan. 26, 1886 | H.R. Illingworth, J.J. Illingworth | Steam Engine Recorder | steam engine indicators |
| 343,291 | Jun. 08, 1886 | C.W. Barnaby | Steam Engine Indicator | steam engine indicators |
| 494,482 | Mar. 28, 1893 | W. Houghtaling | Attachment for Steam Indicators | steam engine indicators |
| 495,148 | Apr. 11, 1893 | R.G. Collins | Electro Mechanical Steam Recording Indicator | industrial recording apparatus |
| 535,152 | Mar. 05, 1895 | M.J. Wayne | Steam Engine Indicator | steam engine indicators |
| 539,244 | May 14, 1895 | E.L. Abbott | Power Meter | steam engine power meters |
| 568,784 | Oct. 06, 1896 | E.L. Miller | Automatic Recording Instrument | steam engine indicators |
| 575,202 | Jan. 12, 1897 | C.H. Bedell | Steam Engine Indicator | steam engine indicators |
| 615,161 | Nov. 29, 1898 | T. Gray | Continuous Engine Indicator | steam engine indicators |
| 619,049 | Feb. 07, 1899 | J.C. Paige | Steam Engine Indicator | steam engine indicators |
| 670,903 | Mar. 26, 1901 | J.J. McTighe | Indicator | steam engine power meters |
| 678,421 | Jul. 16, 1901 | E. Norden | Steam Engine Indicator | steam engine indicators |
