Ladder step
United States Patent 2709626
US Patent References:
/0257463.html
- - 0257463

/1118385.html
- - 1118385

/1216214.html
- - 1216214

Tubing handling board for derricks
- - 2191643

Ladder bracket
- - 2407541


Inventors:
Woodburn, Harriett M.
Publication Date:
05/31/1955
View Patent Images:
Download PDF 2709626 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Woodburn, Harriett M.
Primary Class:
182/121
Other Classes:
248/238, 182/222
International Classes:
E06C7/16; E06C7/00
US Patent References:
2432206Ladder step
2554120Receptacle holder
Foreign References:
CH127486A
CH132835A