You can search the California death index for 1905-1939 at www.familysearch.org There was one Fred Springer, one Fred F. Springer, and one Frederick G. Springer who died between 1930-1939

The most likely one was Fred F. Springer, age 73, place code 60 (City of Alameda) who died on September 15, 1938. Also,his spouses initials were NP This is prior to the voting record, but is it possible those are people who registered to vote in the past, but didn't actually vote in that year?

https://familysearch.org/pal:/MM9.3.1/TH-1961-26180-44630-85...