(
81953
of
81953
)
Full text is not available for this patent. Click on "Images" button above to view full patent.
United States Patent
2,094,169
Issue Date:
September 28, 1937
Current U.S. Class:
166/176
; 166/241.4
Current International Class:
E21B 37/02 (20060101); E21B 37/00 (20060101); E21B 17/00 (20060101); E21B 17/10 (20060101)
* * * * *
![[US Patent & Trademark Office, Patent Full Text and Image Database]](/netaicon/PTO/patfthdr.gif)
![[Home]](/netaicon/PTO/home.gif)
![[Boolean Search]](/netaicon/PTO/boolean.gif)
![[Manual Search]](/netaicon/PTO/manual.gif)
![[Number Search]](/netaicon/PTO/number.gif)
![[Help]](/netaicon/PTO/help.gif)
![[PREV_LIST]](/netaicon/PTO/prevlist.gif)
![[HIT_LIST]](/netaicon/PTO/hitlist.gif)
![[PREV_DOC]](/netaicon/PTO/prevdoc.gif)
![[Bottom]](/netaicon/PTO/bottom.gif)
![[View Shopping Cart]](/netaicon/PTO/cart.gif)
![[Add to Shopping Cart]](/netaicon/PTO/order.gif)
![[Image]](/netaicon/PTO/image.gif)
![[Top]](/netaicon/PTO/top.gif)