Title:
Elevating mechanisms
United States Patent 3213574


Inventors:
Melbye, David H.
Turney, Robert K.
Application Number:
US15819761A
Publication Date:
10/26/1965
Filing Date:
12/11/1961
Assignee:
Melbye
Primary Class:
International Classes:
E04H12/18
View Patent Images:
US Patent References:
2942700Telescoping tower1960-06-28
1376150Joint-lock1921-04-26
0722552N/A1903-03-10
0133017N/A1872-11-12