Bigelow Brothers & Kennard were recorded in the Boston Daily Evening Transcript (Boston, Massachusetts) in an advertisement that ran from November 20, 1849 to February 12, 1850.  Daguerreotype Plates.  A consignment of French Daguerreotype Plates just received and for sale low, at 121 Washington Street.

Bigelow Brothers & Kennard are a new names and were not recorded in A Directory of Massachusetts Photographers, 1839-1900.