USD183574S - Tread-grating unit - Google Patents

Tread-grating unit Download PDF

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Publication number
USD183574S
USD183574S US D183574 S USD183574 S US D183574S
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US
United States
Prior art keywords
tread
grating unit
unit
grating
liskey
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Ernest C. Liskey
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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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