5.4 Years 1920-1929

Number of slide rules: 23.

Year Maker Model
c.1920 K&E 4088-5
c.1920 Nestler 1a
1921 Faber-Castell 363
1922 K&E 4035
1922 K&E 4088-3
1922 K&E 4092-3
1923 Faber-Castell 379
1923 K&E 4088-3
1923 K&E 4088-1
1923 K&E 4092-3
1923 K&E 4092-3
1924 KHH Mannheim Multiphase Adjustable
1924-1933 Nestler 33 Chemiker
1925 K&E N4053-3
1925 K&E 4092-3
c.1925 Nestler 41 Pocket
c.1925-1930 KHH Mannheim Multiphase Adjustable
1925-1936 K&E 4058
1928 K&E N4053-3F
c.1928 P.A.S. Co.  Engraving Rule
1929 K&E 4092-3
1929 K&E 4092-3
1929-1937 K&E 4058C