Elliot briefly mentions Jacob Glahn and possibly his sons; A.E. Spangler and perhaps his brother Wilton; L. Delunsch; R.A. Arthur; possibly Frank Mason and sons Roy and Max; and R. Kornbrath.

I have found Spangler(s) and Glahn(s) in the Syracuse city directories around 1887.

Albert E. Spangler engraver 415 Prospect avenue Syracuse New York 1889 1890

Jacob Glahn
Occupation: engraver
Business Address: 110 south Clinton
Home Address: Kennedy n. south Onondaga
City: Syracuse
State: New York
Year: 1887 1888

Augustus Glahn
Occupation: engraver
Home Address: boards Kennedy n. south Onondaga
City: Syracuse
State: New York
Year: 1887 1888

George J. Glahn
Occupation: engraver
Home Address: Cortland avenue. n. W. Castle
City: Syracuse
State: New York
Year: 1887 1888

Theodore Glahn
Occupation: engraver
Home Address: 188 Lodi
City: Syracuse
State: New York
Year: 1887 1888

Milton C. Spangler
Occupation: engraver
Home Address: boards 113 Townsend
City: Syracuse
State: New York
Year: 1887 1888

I think Kornbrath came later as Daryl stated.

Pete