File:Advancing technology steadily improved efficiency of highway construction.jpg
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Advancing_technology_steadily_improved_efficiency_of_highway_construction.jpg (650 × 363 pixels, file size: 169 KB, MIME type: image/jpeg)
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Summary
| Description |
English: Advancing technology steadily improved efficiency of highway construction, exemplified by this "train" of pavement-laying machinery developed in the 1960's. It allows continuous production of steel-reinforced concrete roadways. |
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| Source | https://en.wikisource.org/wiki/Page:Making_Michigan_Move.pdf/30 |
| Author | Unknown author |
Licensing
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This work is in the public domain because it was published in the United States between 1978 and March 1, 1989 without a copyright notice, and its copyright was not subsequently registered with the U.S. Copyright Office within 5 years. Unless its author has been dead for several years, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macau), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See this page for further explanation.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:27, 10 December 2021 | | 650 × 363 (169 KB) | Sp1nd01 | Uploaded a work by Unknown author from https://en.wikisource.org/wiki/Page:Making_Michigan_Move.pdf/30 with UploadWizard |
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