| All Patents in class 346/4 |
Patents 1 -
10
of 58
      |
| Picture | Number | Date | Patentee | Title |
| | 41,182 | Jan. 05, 1864 | W.B. Le Van, S.L. Wiegand | Steam Engine Indicator |
| | 265,198 | Sep. 26, 1882 | J.B. Webb | Diagram Instrument for Engines |
| | 334,778 | Jan. 26, 1886 | H.R. Illingworth, J.J. Illingworth | Steam Engine Recorder |
| | 334,779 | Jan. 26, 1886 | H.R. Illingworth, J.J. Illingworth | Steam Engine Recorder |
| | 343,291 | Jun. 08, 1886 | C.W. Barnaby | Steam Engine Indicator |
| | 494,482 | Mar. 28, 1893 | W. Houghtaling | Attachment for Steam Indicators |
| | 495,148 | Apr. 11, 1893 | R.G. Collins | Electro Mechanical Steam Recording Indicator |
| | 535,152 | Mar. 05, 1895 | M.J. Wayne | Steam Engine Indicator |
| | 539,244 | May 14, 1895 | E.L. Abbott | Power Meter |
| | 568,784 | Oct. 06, 1896 | E.L. Miller | Automatic Recording Instrument |
