| Patents for Charles Zelnick |
Patents 1 -
15
of 20
      |
| Number | Date | Patentee | Title | Type |
| 2,665,490 | Jan. 12, 1954 | C. Zelnick | Micrometer Gauge | micrometers |
| 2,694,861 | Nov. 23, 1954 | C. Zelnick | Machinists gauge | |
| 2,713,206 | Jul. 19, 1955 | C. Zelnick | Folding rule joint | folding rule joints |
| 2,726,626 | Dec. 13, 1955 | C. Zelnick | Dial test indicator | |
| 2,727,701 | Dec. 20, 1955 | C. Zelnick | Tape measure | tape measures |
| 2,805,483 | Sep. 10, 1957 | C. Zelnick | Micrometer gauges | measurement gauges |
| 2,826,820 | Mar. 18, 1958 | C. Zelnick | Hole gauges | |
| 2,837,296 | Jun. 03, 1958 | C. Zelnick | Anti friction tape meauring case | |
| 2,855,686 | Oct. 14, 1958 | C. Zelnick | Measuring rod locking means for depth gauge micrometers | depth gauges |
| 2,876,552 | Mar. 10, 1959 | C. Zelnick | Machinists gauges | |
| 2,883,758 | Apr. 28, 1959 | C. Zelnick | Apparatus for measuring the size and symmetry of an opening formed in a work piece | |
| 2,899,839 | Aug. 18, 1959 | C. Zelnick | Apparatus for extending the length of a measuring tape winding crank handle | |
| 2,900,733 | Aug. 25, 1959 | C. Zelnick | Indicators with resilient means for reversing the bias of the operating spindle | |
| 2,904,282 | Sep. 15, 1959 | C. Zelnick | Spring reel measuring tape | |
| 2,911,726 | Nov. 10, 1959 | C. Zelnick | Indicator | measurement gauges |
