JPS57107896A - Blackboard containing obscure ray - Google Patents
Blackboard containing obscure rayInfo
- Publication number
- JPS57107896A JPS57107896A JP18483980A JP18483980A JPS57107896A JP S57107896 A JPS57107896 A JP S57107896A JP 18483980 A JP18483980 A JP 18483980A JP 18483980 A JP18483980 A JP 18483980A JP S57107896 A JPS57107896 A JP S57107896A
- Authority
- JP
- Japan
- Prior art keywords
- obscure
- ray
- blackboard
- blackboard containing
- obscure ray
- 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
- Drawing Aids And Blackboards (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18483980A JPS5953195B2 (en) | 1980-12-24 | 1980-12-24 | blackboard with dark lines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18483980A JPS5953195B2 (en) | 1980-12-24 | 1980-12-24 | blackboard with dark lines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57107896A true JPS57107896A (en) | 1982-07-05 |
JPS5953195B2 JPS5953195B2 (en) | 1984-12-24 |
Family
ID=16160209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18483980A Expired JPS5953195B2 (en) | 1980-12-24 | 1980-12-24 | blackboard with dark lines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5953195B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57159699A (en) * | 1981-03-26 | 1982-10-01 | Sakura Finetechnical Co Ltd | Manufacture of blackboard on which dark line is drawn |
-
1980
- 1980-12-24 JP JP18483980A patent/JPS5953195B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57159699A (en) * | 1981-03-26 | 1982-10-01 | Sakura Finetechnical Co Ltd | Manufacture of blackboard on which dark line is drawn |
Also Published As
Publication number | Publication date |
---|---|
JPS5953195B2 (en) | 1984-12-24 |
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