File:Plasti-slate 001.jpg

Original file (1,700 × 2,338 pixels, file size: 739 KB, MIME type: image/jpeg)

Summary

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

This work is in the public domain in the United States because it was published in the United States between 1931 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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Captions

Advertisement for the first dry-erase / whiteboard by Martin Heit

Items portrayed in this file

depicts

copyright status

copyrighted, dedicated to the public domain by copyright holder

public domain

copyright license

released into the public domain by the copyright holder

inception

17 June 2013

data size

756,745 byte

height

2,338 pixel

width

1,700 pixel

media type

image/jpeg

checksum

36ee8aa5cbceb503be71db0c13bb58c745543539

determination method or standard: SHA-1

File history

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Date/TimeThumbnailDimensionsUserComment
current12:47, 17 June 2013Thumbnail for version as of 12:47, 17 June 20131,700 × 2,338 (739 KB)ScottmaggieUser created page with UploadWizard

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