ES2119671A1 - Calculator for teaching addition and subtraction - Google Patents
Calculator for teaching addition and subtractionInfo
- Publication number
- ES2119671A1 ES2119671A1 ES09600074A ES9600074A ES2119671A1 ES 2119671 A1 ES2119671 A1 ES 2119671A1 ES 09600074 A ES09600074 A ES 09600074A ES 9600074 A ES9600074 A ES 9600074A ES 2119671 A1 ES2119671 A1 ES 2119671A1
- Authority
- ES
- Spain
- Prior art keywords
- calculator
- subtraction
- base
- elements
- teaching
- 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.)
- Granted
Links
Landscapes
- Toys (AREA)
Abstract
It consists of a base with two rods which are identical in size and section, and which are parallel to each other and perpendicular to said base, and twenty centre- perforated threadable elements (beads), a maximum of ten of which can be slipped onto each rod. Every five elements have a different colour from the remaining groups. This calculator applies to the field of teaching arithmetic (calculation, calculus) at infant and primary education and special education level.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9600074A ES2119671B1 (en) | 1996-01-05 | 1996-01-05 | PEDAGOGICAL CALCULATOR FOR THE SUM AND THE SUBTRACT. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9600074A ES2119671B1 (en) | 1996-01-05 | 1996-01-05 | PEDAGOGICAL CALCULATOR FOR THE SUM AND THE SUBTRACT. |
Publications (2)
Publication Number | Publication Date |
---|---|
ES2119671A1 true ES2119671A1 (en) | 1998-10-01 |
ES2119671B1 ES2119671B1 (en) | 1999-05-16 |
Family
ID=8293403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES9600074A Expired - Lifetime ES2119671B1 (en) | 1996-01-05 | 1996-01-05 | PEDAGOGICAL CALCULATOR FOR THE SUM AND THE SUBTRACT. |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES2119671B1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1475487A (en) * | 1922-09-12 | 1923-11-27 | Robert J Hammond | Adjustable clamp for rubber pipes and the like |
AU638646A (en) * | 1946-09-04 | 1947-09-04 | Commonwealth Scientific And Industrial Research Organization | Improved radio distance measuring device and time interval measuring means |
US3731401A (en) * | 1971-05-21 | 1973-05-08 | T Kojima | Abacus instruction device |
GB2111268A (en) * | 1981-09-11 | 1983-06-29 | Dennis Richard Quilter | Abacus |
-
1996
- 1996-01-05 ES ES9600074A patent/ES2119671B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1475487A (en) * | 1922-09-12 | 1923-11-27 | Robert J Hammond | Adjustable clamp for rubber pipes and the like |
AU638646A (en) * | 1946-09-04 | 1947-09-04 | Commonwealth Scientific And Industrial Research Organization | Improved radio distance measuring device and time interval measuring means |
US3731401A (en) * | 1971-05-21 | 1973-05-08 | T Kojima | Abacus instruction device |
GB2111268A (en) * | 1981-09-11 | 1983-06-29 | Dennis Richard Quilter | Abacus |
Also Published As
Publication number | Publication date |
---|---|
ES2119671B1 (en) | 1999-05-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EC2A | Search report published |
Date of ref document: 19981001 Kind code of ref document: A1 Effective date: 19981001 |