Adjustable lamp shades
United States Patent 2997576
US Patent References:
/0032740.html
- - 0032740

/0480989.html
- - 0480989

Lamp shade
- - 1929315

Lamp shade
- - 2710339


Inventors:
Heitshu, William A.
Publication Date:
08/22/1961
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Assignee:
Heitshu, William A.
Primary Class:
362/322
Other Classes:
362/356
International Classes:
F21V1/00
Foreign References:
CA466463A