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| All Patents in class 261/121.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,864,149 | Jun. 21, 1932 | S.P. Rockwell | Agitator for hardening baths | metal hardening | |
| 2,074,597 | Mar. 23, 1937 | R.E. Stark | Aerating apparatus | ||