JPS57159699A - Manufacture of blackboard on which dark line is drawn - Google Patents

Manufacture of blackboard on which dark line is drawn

Info

Publication number
JPS57159699A
JPS57159699A JP4498781A JP4498781A JPS57159699A JP S57159699 A JPS57159699 A JP S57159699A JP 4498781 A JP4498781 A JP 4498781A JP 4498781 A JP4498781 A JP 4498781A JP S57159699 A JPS57159699 A JP S57159699A
Authority
JP
Japan
Prior art keywords
blackboard
drawn
manufacture
dark line
dark
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.)
Pending
Application number
JP4498781A
Other languages
Japanese (ja)
Inventor
Heitarou Muramoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sakura Seiki Co Ltd
Original Assignee
Sakura Seiki Co Ltd
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 Sakura Seiki Co Ltd filed Critical Sakura Seiki Co Ltd
Priority to JP4498781A priority Critical patent/JPS57159699A/en
Publication of JPS57159699A publication Critical patent/JPS57159699A/en
Pending legal-status Critical Current

Links

Landscapes

  • Drawing Aids And Blackboards (AREA)
JP4498781A 1981-03-26 1981-03-26 Manufacture of blackboard on which dark line is drawn Pending JPS57159699A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4498781A JPS57159699A (en) 1981-03-26 1981-03-26 Manufacture of blackboard on which dark line is drawn

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4498781A JPS57159699A (en) 1981-03-26 1981-03-26 Manufacture of blackboard on which dark line is drawn

Publications (1)

Publication Number Publication Date
JPS57159699A true JPS57159699A (en) 1982-10-01

Family

ID=12706800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4498781A Pending JPS57159699A (en) 1981-03-26 1981-03-26 Manufacture of blackboard on which dark line is drawn

Country Status (1)

Country Link
JP (1) JPS57159699A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3195909U (en) * 2014-11-26 2015-02-12 日学株式会社 Case-integrated magnet screen
JP2015136023A (en) * 2014-01-16 2015-07-27 富士通株式会社 Redundant path provision method and transmission apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57107896A (en) * 1980-12-24 1982-07-05 Yodogawa Steel Works Blackboard containing obscure ray

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57107896A (en) * 1980-12-24 1982-07-05 Yodogawa Steel Works Blackboard containing obscure ray

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015136023A (en) * 2014-01-16 2015-07-27 富士通株式会社 Redundant path provision method and transmission apparatus
JP3195909U (en) * 2014-11-26 2015-02-12 日学株式会社 Case-integrated magnet screen

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