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Pump.
Patent for an improved pump valve designed for a pump for pumping oil from oil wells "which will not be affected by the fluid or gas pressure in the bore" (lines 17-18).
Date:
September 30, 1919
Creator:
Graf, Sydney H.
Object Type:
Patent
System:
The Portal to Texas History
2007 Economic Census Map: Houston-Baytown-Huntsville, Texas Combined Statistical Area
Map showing the area of the Houston-Baytown-Huntsville, Texas Combined Statistical Area for which the U.S. Census Bureau collected data during the 2007 economic census.
Date:
2007
Creator:
United States. Bureau of the Census.
Object Type:
Map
System:
The Portal to Texas History