File:Large Air Sound Detector Type 90.jpg
![File:Large Air Sound Detector Type 90.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Large_Air_Sound_Detector_Type_90.jpg/800px-Large_Air_Sound_Detector_Type_90.jpg?20130215151737)
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Summary
[edit]DescriptionLarge Air Sound Detector Type 90.jpg |
English: Pre-World War 2 photograph of Japanese Emperor Hirohito inspecting an array of acoustic aircraft locators. Their precise location is unknown. Prior to the development of radar in World War 2, military air defence forces used these devices to locate approaching enemy aircraft by listening for the sound of their engines. |
Date | |
Source | LIFE Magazine, 1936 |
Author | Unknown authorUnknown author |
Licensing
[edit]Public domainPublic domainfalsefalse |
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This photograph is in the public domain in Japan because its copyright has expired according to Article 23 of the 1899 Copyright Act of Japan (English translation) and Article 2 of Supplemental Provisions of Copyright Act of 1970. This is when the photograph meets one of the following conditions:
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current | 15:17, 15 February 2013 | ![]() | 1,197 × 766 (139 KB) | Ohkabaka (talk | contribs) | User created page with UploadWizard |
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