Lodge model R6/30 resistance indicator for use in conjunction with double pole type heater plugs (6 cylinder engine)
1934
1934
1929
circa 1922
1933-1943
1934
1934
1933
1950-1970
1955-1960
circa 1951
1909-1913
1920
1914-1918
1929
1925
c.1950
1937
circa 1949