- 40 Water, Boston, MA (works)
- General Offices and Factory, Lowell, Massachusetts
- Factory: Perry Street, Lowell, Massachusetts
- Branch offices: Boston (813 Old South Building), New York City,
Washington, Chicago, Kansas City, Cleveland, St. Louis.
("Agents in Large Cities throughout the United States").
- Henry C. King, President 
- J. L. Campbell, Treasurer 
1917 Letter to Rundle & White
"Lamson is also credited with the introduction of safety
treads for stairs in 1890. While on a trip to Europe, he noted
them being used. Upon his return to the U.S., Lamson founded
the American Mason Safety Tread Company and began to manufacture
treads in a factory on Perry Street. They were advertised as
noiseless, fireproof, clean and protective. By 1930 over 10
million square feet of treads were in service."
—Elizabeth Durfee Hengen,
"Nesmith Street, Belvidere - Nesmith Street, 209 - Lamson House"
(1981). Lowell Neighborhoods: Historical and Architectural
Survey. Paper 563. Lowell: City of Lowell.
- 1890 · Established by William S. Lamson (1845-1912)
- 1968 · Closed