Number | Date | Country | Kind |
---|---|---|---|
58-195269 | Oct 1983 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
1984121 | Drescher | Dec 1934 | |
4417816 | Kiudl | Nov 1983 |
Number | Date | Country |
---|---|---|
203502 | Mar 1939 | SEX |
248883 | May 1947 | SEX |
509416 | Apr 1976 | SUX |
Entry |
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SPIE vol. 235, Aspheric Optics, Design, Manuf. Testing, Article by Tom G. Gijsbers, "Colath,--Philips Research, pp. 43-49. |