DE172916C - - Google Patents
Info
- Publication number
- DE172916C DE172916C DENDAT172916D DE172916DA DE172916C DE 172916 C DE172916 C DE 172916C DE NDAT172916 D DENDAT172916 D DE NDAT172916D DE 172916D A DE172916D A DE 172916DA DE 172916 C DE172916 C DE 172916C
- Authority
- DE
- Germany
- Prior art keywords
- ball
- bracket
- numbers
- row
- rows
- 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
- 229920002160 Celluloid Polymers 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)
- Toys (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE172916C true DE172916C (cs) |
Family
ID=437768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT172916D Active DE172916C (cs) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE172916C (cs) |
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0
- DE DENDAT172916D patent/DE172916C/de active Active
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