California death index has a few David Friedman men born about 1893 - give or take a year or so
Do you have anything at all more that you can give to help find them.
In 1940 census for San Diego, there is a Dave Friedman, age 48, born Hungary, married to Bertha, age 44, born Colorado and they have two sons Lester, 17 born California and Stanley age 11, born California.
In 1930 they are also in San Diego Dave 38, Lester 8, and Stanley 1-10/12 Bertha is not there for some reason
?? they are as you see, in San Diego, not San Fran. or LA
Lester was bornMay 24, 1922 San Diego and shows mother's maiden name as HARWITZ
Stanley was born May 24, 1928 San Diego, mother's maiden name HARWITZ
How sure are you of where he lived in CA ?
Also do you by chance have David's actual birth date as this can help to find him in death records.
For instance in California death records there are
Davie E. Friedman born June 2, 1893 died jan. 19, 1960 Santa Barbara
David Friedman born July 12, 1892 died march 12, 1952San Bernadino (one you saw?) Mother's maiden name HENNA
David Friedman born Nov. 15, 1893 died Dec. 31,1967 LA
David Friedman born May 5, 1892 died Jan. 6, 1960 LA mother's maiden name SHAPIRO
David Friedman born May 15, 1892 died Aug. 7, 1960 San Diego mother's maiden name MOSKOWIT
so not all show mother's maiden name, but if you know it you could eliminate those that do not match.
the Bertha above born Colorado seems to be in deaths as born May 9, 1896 Colorado died Feb. 20, 1986 San Diego father's surname HARWITZ
So if you have anything more on David such as birthdate, wife's name, names of children etc. that could help narrow it down that would help.