Number | Name | Date | Kind |
---|---|---|---|
D204306 | Hamm | Apr 1966 | |
D261423 | Geissler | Oct 1981 | |
3352311 | Murphy | Nov 1967 | |
3799179 | Thomas | Mar 1974 | |
4112955 | Gollel | Sep 1978 |
Entry |
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Blackstone Ultrasonic Cleaner brochure, Model SP-100. |
National Jeweler, 9-1970, p. 16, 3 Ultrasonic Cleaning Systems. |