File:Plasti-slate 001.jpg
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Captions
Captions
Advertisement for the first dry-erase / whiteboard by Martin Heit
Summary[edit]
| Description |
English: Original early 1960's ad for "Plasti-slate" the first whiteboard/dry erase board invented by Martin Heit |
| Date | |
| Source | Martin Heit inventor of the whiteboard/dry erase board |
| Author | Martin Heit inventor of the whiteboard/dry erase board |
Licensing[edit]
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:47, 17 June 2013 | | 1,700 × 2,338 (739 KB) | Scottmaggie (talk | contribs) | User created page with UploadWizard |
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