Number | Name | Date | Kind |
---|---|---|---|
3186323 | Niehaus | Jun 1965 | |
3403460 | Barrows | Aug 1968 |
Entry |
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"Printing-Out Paper", Focal Encyclopedia of Photography, c. 1969, Focal Press Ltd.; pp. 1173, 1175, 1176. |
Product Engineering; Jan. 9, 1961; "What You Can Do With Flexible Magnets", by Annesta R. Gardner, pp. 65-68. |