Not a town, the company name
Nettleton Manufacturing Co, Middletown,CT
The Metal Worker, Plumber, and Steam Fitter, Volume 64 - 1905 (google)
Also...likely Patent 821,183, to J. N. Nettleton, for Nippers, May 22, 1906
(Not in datamp at all)
Edit: Noting the dates,...nothing like jumping the gun on your patent...lol