KR870018875U - Jusansik mental arithmetic learning version - Google Patents

Jusansik mental arithmetic learning version

Info

Publication number
KR870018875U
KR870018875U KR2019860006050U KR860006050U KR870018875U KR 870018875 U KR870018875 U KR 870018875U KR 2019860006050 U KR2019860006050 U KR 2019860006050U KR 860006050 U KR860006050 U KR 860006050U KR 870018875 U KR870018875 U KR 870018875U
Authority
KR
South Korea
Prior art keywords
jusansik
mental arithmetic
arithmetic learning
learning version
version
Prior art date
Application number
KR2019860006050U
Other languages
Korean (ko)
Other versions
KR890002876Y1 (en
Inventor
이찬희
김성연
Original Assignee
이찬희
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 이찬희 filed Critical 이찬희
Priority to KR2019860006050U priority Critical patent/KR890002876Y1/en
Publication of KR870018875U publication Critical patent/KR870018875U/en
Application granted granted Critical
Publication of KR890002876Y1 publication Critical patent/KR890002876Y1/en

Links

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
    • 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
    • G09B3/00—Manually or mechanically operated teaching appliances working with questions and answers
    • G09B3/02—Manually or mechanically operated teaching appliances working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student
    • G09B3/04—Manually or mechanically operated teaching appliances working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student of chart form
    • G09B3/045—Manually or mechanically operated teaching appliances working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student of chart form with invisibly printed correct answer; the answer being rendered visible by special optical means, e.g. filters; mirrors
KR2019860006050U 1986-05-01 1986-05-01 Learning plate for the metal arithmetic of abacus calculation type KR890002876Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019860006050U KR890002876Y1 (en) 1986-05-01 1986-05-01 Learning plate for the metal arithmetic of abacus calculation type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019860006050U KR890002876Y1 (en) 1986-05-01 1986-05-01 Learning plate for the metal arithmetic of abacus calculation type

Publications (2)

Publication Number Publication Date
KR870018875U true KR870018875U (en) 1987-12-26
KR890002876Y1 KR890002876Y1 (en) 1989-05-08

Family

ID=19251309

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019860006050U KR890002876Y1 (en) 1986-05-01 1986-05-01 Learning plate for the metal arithmetic of abacus calculation type

Country Status (1)

Country Link
KR (1) KR890002876Y1 (en)

Also Published As

Publication number Publication date
KR890002876Y1 (en) 1989-05-08

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Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
N231 Notification of change of applicant
E701 Decision to grant or registration of patent right
REGI Registration of establishment
LAPS Lapse due to unpaid annual fee