Patents for inventions; abridgments intended to serve as guides to specifications; patents cover road machinery, surface-treatment equipment and methods, road materials, etc. (class 107, period 1921-25)
Roads and ways
Abridgments Specifications
1929
94 pages
Aufsatz (Zeitschrift)
Englisch
© Metadata Copyright Elsevier B. V. All rights reserved.
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