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Lighting Design & Application, 6-1980, p. 50, North American Philips Lighting Corp. S L Lamp. |
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Official Gazette Issued on Feb. 28, 1961, U.S. Pat. No. Des. 189,822. |
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Official Gazette Issued on Dec. 1, 1962, Japanese Design Registration No. 211701 Registered on 4/10/62. |