This firms dates back to at least 1872, and it survived to at least 1898. The principals were John Connell and Valentine Dengler.
This firm made a variety of woodworking machines, including large planers and bandsaws, swing saws, and cut-off saws.
One notable achievement due to John Connell is that he received the first patent for a tablesaw trunnion mechanism. Previous tablesaw designs used a hinge to pivot the blade and tabletop in relation to one another. Connell's trunnion design places the axis of rotation on the plane of the tabletop, which keeps the blade centered in its slot and makes small adjustments simpler.
- Ad in 1872 edition of the Rochester Directory.
- Mentioned in 1882 Manufacturer & Builder. An 1882 article in that journal describes a patent granted to John Connell and V. Dengler for a swing saw. A couple of 1885 articles describe patents granted to Connell for a swing saw and a planer feed roll.
- Ad in May 1889 issue of The Wood-Worker.
- Planers, Matchers & Molders in America lists this firm as one that was around in 1897.
- A Connell & Dengler bandsaw, labeled "Connell & Dengler Machine Company," has three patent dates, the latest being in 1897. The patents are variously to John Connell and Valentine Dengler.