哈羅德·H·西華德 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "哈羅德·H·西華德" in Chinese language version.

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espacenet.com

worldwide.espacenet.com

  • US patent 3137794,Seward, Harold H.,「Directionally Sensitive Light Detector」,发行于1964-06-16 
  • US patent 3657549,Low, George M.; Seward, Harold H. & Gorstein, Mark et al.,「Two-Color Horizon Sensor」,发行于1972-04-18 

legacy.com

nsysu.edu.tw

par.cse.nsysu.edu.tw

web.archive.org