DE258668C - - Google Patents
Info
- Publication number
- DE258668C DE258668C DENDAT258668D DE258668DA DE258668C DE 258668 C DE258668 C DE 258668C DE NDAT258668 D DENDAT258668 D DE NDAT258668D DE 258668D A DE258668D A DE 258668DA DE 258668 C DE258668 C DE 258668C
- Authority
- DE
- Germany
- Prior art keywords
- drums
- digits
- arithmetic
- rack
- drum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000000284 resting Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B19/00—Teaching not covered by other main groups of this subclass
- G09B19/02—Counting; Calculating
Landscapes
- Business, Economics & Management (AREA)
- Engineering & Computer Science (AREA)
- Entrepreneurship & Innovation (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Collation Of Sheets And Webs (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE258668C true DE258668C (ko) |
Family
ID=516473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT258668D Active DE258668C (ko) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE258668C (ko) |
-
0
- DE DENDAT258668D patent/DE258668C/de active Active
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