July 27, 1874 – Company organized at 352 Longwood Avenue, Roxbury.
1889 – Company members of Chemical Engine Company 3 (Roxbury) in 1889:
1. Engineman Thomas H. Weltch.
2. Hoseman George R. Williams, driver.
3. Hoseman George R. Knight.
4. Hoseman John S. Keenan.
Firehouse at 352 Longwood Avenue, Roxbury.
October 4, 1901 – COMPANY DESIGNATION CHANGED. Company became Combination Ladder Co. 10.