USD183574S - Tread-grating unit - Google Patents
Tread-grating unit Download PDFInfo
- Publication number
- USD183574S USD183574S US D183574 S USD183574 S US D183574S
- Authority
- US
- United States
- Prior art keywords
- tread
- grating unit
- unit
- grating
- liskey
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
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Description
United States Patent 0 ice TREAD-GRATING UNIT Ernest C. Liskey, Jr., Severna Park, Md.
Application April 11, 1958, Serial No. 50,444-
Term of patent 14 years (Cl. D13-1) Figure 1 is a perspective view of a tread-grating unit showing my new design; and
Figure 2 is an end elevation thereof.
The side and end of the unit, not shown, are like the side and end of the unit which is shown.
I claim:
The ornamental design for a tread-grating unit, as shown and described.
References Cited in the file of this patent UNITED STATES PATENTS Liskey Mar. 3, 1953 Brockman Apr. 29, 1941 Des. 183,574 Patented Sept. 23, 1958 OTHER REFERENCES The Harrington and King Perforation Company Catalog #62, 1954, page 60, second row, item from right.
Modern Metals for April 1956, page 82, lower left illustration.
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