Source for obituary:
San Francisco Examiner, Saturday, September 4, 1920, page 4
Died 9/1/1920 in San Mateo County, CA
Salt Worker Killed
San Mateo, Sept. 3 - William Mutzenberg, a Swiss employed by the Leslie Salt Company, died at a hospital here from injuries received late yesterday when he fell into a salt conveyor at the company's plant near San Mateo. He was a member of the Swiss Alpenrosby Lodge of San Francisco. He leaves a wife and three children.
[Oakland Tribune September 3, 1920, page 7]