GB190421974A - An Improved Blackboard Cleaner. - Google Patents
An Improved Blackboard Cleaner.Info
- Publication number
- GB190421974A GB190421974A GB190421974DA GB190421974A GB 190421974 A GB190421974 A GB 190421974A GB 190421974D A GB190421974D A GB 190421974DA GB 190421974 A GB190421974 A GB 190421974A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strips
- holder
- cleaner
- blackboards
- blackboard cleaner
- 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.)
- Expired
Links
Abstract
21,974. Bearder, S. Oct. 12. Blackboards.-A cleaner for blackboards or the like is constructed so that the felt or like strips can be adjusted or renewed. The strips B, Fig. 2, are clipped in a spring holder A, which is made of steel or other sheet and may be serrated at the edges to increase the grip. A tool D, Fig. 5, is provided to engage in holes in the holder A and expand the holder to permit of adjustment or renewal of the strips B. The strips B may be separated by cardboard or like strips C, perforated or scored at intervals for detachment of the outer edges as the strips B wear down.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190806046D GB190806046A (en) | 1904-10-12 | 1908-03-18 | An Improved Blackboard Cleaner. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190421974T | 1904-10-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190421974A true GB190421974A (en) | 1905-08-17 |
Family
ID=32166031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190421974D Expired GB190421974A (en) | 1904-10-12 | 1904-10-12 | An Improved Blackboard Cleaner. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190421974A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2759212A (en) * | 1952-08-08 | 1956-08-21 | Polaroid Corp | Applicator devices for applying coatings to photographic prints |
US2768403A (en) * | 1953-05-27 | 1956-10-30 | Polaroid Corp | Applicator device for applying liquid coating to photographic prints |
-
1904
- 1904-10-12 GB GB190421974D patent/GB190421974A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2759212A (en) * | 1952-08-08 | 1956-08-21 | Polaroid Corp | Applicator devices for applying coatings to photographic prints |
US2768403A (en) * | 1953-05-27 | 1956-10-30 | Polaroid Corp | Applicator device for applying liquid coating to photographic prints |
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