| Year |
Number |
Description |
| 1907 |
206428 |
Metal strips embedded in the stator and slide
perpendicular to the scales, to improve stability. |
| 1909 |
215722 |
Stator floor milled out for cubic scale.
Applicant is Pickworth. |
| 1922 |
365637 |
Stator parts connected by screws that permit
adjustment of the slide action. |
| 1926 |
450304 |
An adjustable half cyclinder lens in the cursor
frame |
| 1930 |
559664 |
Metal core fastened in plastic with rivets or
screws. |
| 1932 |
574594 |
Duplex slide rule with adjustable strap-joint |
| 1933 |
596286 |
Duplex slide rule with adjustable strap-joint |
| 1933 |
625535 |
Cursor for duplex slide rule |
| 1934 |
1289083 |
Pocket slide rule |
| 1934 |
1314631 |
Two-sided slide rule with markings that
correspond on both sides. |
| 1935 |
1348341 |
Cursor |
| 1935 |
1354648 |
Darmstadt slide rule |
| 1936 |
1394384 |
Slide rule |
| 1936 |
655353 |
Slide rule with adding device (Addiator) on the
back. Invented by C. Kübler. |
| 1937 |
684135 |
Metal slide rule with plastic veneer |
| 1937 |
1400134 |
Slide rule for surveying |
| 1940 |
1484667 |
"Frameless" cursor |
| 1940 |
1486119 |
Slide rule, Leipzig trade fair |
| 1941 |
1506113 |
Slide rule |
| 1951 |
804932 |
Measuring and calculating device for the graphic
trades. Eventually produced as model 2/66. Invented by M. Schirmer. |
| 1951 |
821840 |
Device for testing concrete. Invented by F.
Kluge. Produced by Faber-Castell as their 2/62. |
| 1951 |
873455 |
Duplex slid rule strap-joint that are screwed on
and adjustable. Invented by Mr. Bachmann. |
| 1951 |
873456 |
Cursor for duplex slide rule (adjustable).
Invented by Mr. Bachmann. |
| 1952 |
1018659a
1018659b |
Slide with 2 cursors and diagram. Produced as
model 3/31 for reinforeced concrete. Invented by Mr. Bachmann. |
| 1952 |
1062040 |
Window for Addiator inserted in floor or stator.
Invented by Mr. Buelow. |
| 1952 |
1115967a
1115967b |
Cursor which attaches around a single-sided slide
rule (Mathema). |
| 1962 |
1135686a
1135686b |
Slide rule with spring between slide and groove
(to make slide operation smoother). |
| 1964 |
1170170a
1170170b |
Groves on the flanges of the slide of plastic
slide rules. Invented by Mr. Tegtmeyer. |