BBE wroteJanuary 23, 1866 was a Tuesday, Jan 23, 1886 was not. US patents are always issued on Tuesdays.
BBE.
Locks and Lockmakers of America, Rev. Third Edition by Thomas F. Hennessy lists two lock patents issued 1/23/1866:
52,183; M. McGonnigle; Allegheny, PA
52,226; C. Toll; Boston, MA
When I checked Google, the first is for Linoleum floor covering and the second a Display-card. There is thus a discrepancy between Mr. Hennessy’s data and The Official Gazette of the US Patent Office!
Pete Schifferli
[unknown]