Historical Document · 1951
US Design Patent D163,135: Pocket Adding Apparatus (K. R. Pangburn)
Design patent of 1 May 1951 for Pangburn's pocket adder, whose mechanism is virtually identical to the Lightning's.
Historical Document · 1951
Design patent of 1 May 1951 for Pangburn's pocket adder, whose mechanism is virtually identical to the Lightning's.
May 1, 1951 K. R. FANGBURN Des. 163,135 POCKET ADDING APPARATUS Filed Oct. 10, 1949 INVENTOR, R. PANGBURN AGENT Des. 163,135 Patented May 1, 1951 UNITED STATES PATENT OFFICE 163,135 POCKET ADDING APPARATUS Kenneth R. Pangburn, Duluth, Minn. Application October 10, 1949, Serial No. 5,399 Term of patent 14 years (C. D64-11) I claim: To all whom it may concern The ornamental design for a pocket adding Be it known that I, Kenneth R. Pangburn, a citizen of the United States of America, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented a new, original, and ornamental Design for a Pocket Adding Appa ratus, of which the following is a specification, reference being had to the accompanying draw ing, forming a part thereof, apparatus, as shown and described. KENNETH. R. PANGBURN. REFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS In the dra Wing: Fig. 1 is a front perspective view of the pocket adding apparatus, with the cover opened, show ing my new design; and Fig. 2 is a perspective view of the same with the cover closed, the back of the design being plain. Number 501,596 Number 513,501 Name Date Bersbach et al. ------ July 18, 1893 FOREIGN PATENTS Country Date Great Britain ------- Oct. 13, 1939