BOOK
Title:
[Patent for] an alleged new and useful improvement in propellers
Creator:
Callahan, Joseph J.
Publication:
U.S. Patent Office], Washington, D.C, 1927.
Notes:
Reproduction of original patent.
Call #:
509 PAM. NO.469
Extent:
[ii], 4 p. : diagrs. ; 30 1/2 cm.
Subjects:
