KR890010488U - 반투명 유지칠판 - Google Patents

반투명 유지칠판

Info

Publication number
KR890010488U
KR890010488U KR2019870019831U KR870019831U KR890010488U KR 890010488 U KR890010488 U KR 890010488U KR 2019870019831 U KR2019870019831 U KR 2019870019831U KR 870019831 U KR870019831 U KR 870019831U KR 890010488 U KR890010488 U KR 890010488U
Authority
KR
South Korea
Prior art keywords
blackboard
translucent
maintenance
translucent maintenance
maintenance blackboard
Prior art date
Application number
KR2019870019831U
Other languages
English (en)
Other versions
KR900009508Y1 (ko
Inventor
김철
Original Assignee
김철
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 김철 filed Critical 김철
Priority to KR2019870019831U priority Critical patent/KR900009508Y1/ko
Publication of KR890010488U publication Critical patent/KR890010488U/ko
Application granted granted Critical
Publication of KR900009508Y1 publication Critical patent/KR900009508Y1/ko

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/12—Repeatedly-usable boards or tablets for writing or drawing having translucent writing surfaces producing visual impressions by co-operation with backing members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L9/00—Circular curve-drawing or like instruments
    • B43L9/02—Compasses
    • B43L9/04—Beam compasses
    • B43L9/045—Tape compasses
KR2019870019831U 1987-11-17 1987-11-17 반투명 유지칠판 KR900009508Y1 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019870019831U KR900009508Y1 (ko) 1987-11-17 1987-11-17 반투명 유지칠판

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019870019831U KR900009508Y1 (ko) 1987-11-17 1987-11-17 반투명 유지칠판

Publications (2)

Publication Number Publication Date
KR890010488U true KR890010488U (ko) 1989-07-08
KR900009508Y1 KR900009508Y1 (ko) 1990-10-13

Family

ID=19269493

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019870019831U KR900009508Y1 (ko) 1987-11-17 1987-11-17 반투명 유지칠판

Country Status (1)

Country Link
KR (1) KR900009508Y1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112590431A (zh) * 2021-01-06 2021-04-02 杨玮玮 一种数学教学绘图仪

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112590431A (zh) * 2021-01-06 2021-04-02 杨玮玮 一种数学教学绘图仪

Also Published As

Publication number Publication date
KR900009508Y1 (ko) 1990-10-13

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Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 19980922

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee