| All Patents in class 408/179 |
Patents 16 -
25
of 25
      |
| Number | Date | Patentee | Title | Type |
| 1,768,962 | Jul. 01, 1930 | C.C. Koeln | Expansion boring tool | boring heads |
| 1,881,665 | Oct. 11, 1932 | J.E. Kilzer | Expansion boring tool | boring heads |
| 2,689,131 | Sep. 14, 1954 | D.E. Priest | Screwdriver with removable blade | screwdriver blades |
| 2,874,597 | Feb. 24, 1959 | B.E. Bach | Micrometric Boring Head | boring heads |
| 2,878,695 | Mar. 24, 1959 | T.J. Busch | Tool Holder for Boring Bars | drilling and boring tool holders |
| 3,044,323 | Jul. 17, 1962 | A.N. Sweeny | Adjustable boring head | boring heads |
| 3,195,376 | Jul. 20, 1965 | W. Bader | Boring Head | boring heads |
| 3,730,636 | May 01, 1973 | S. Mizoguchi | Boring Head | boring heads |
| 4,043,696 | Aug. 23, 1977 | G. Wohlhaupter | Micrometer Boring Head | boring heads |
| 4,162,867 | Jul. 31, 1979 | D.W. Barton, R.A. Rhinefrank, D.J. Calcaterra | Dual Cutter Boring Head | boring heads |
