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Whiffletree.
Patent for an improvement in whiffletrees, made out of steel. It includes a description and illustration.
Date:
April 21, 1891
Creator:
Flatau, Louis S.
Object Type:
Patent
System:
The Portal to Texas History
Stratigraphy of the Bitmuninous Coal Field of Pennsylvania, Ohio and West Virginia
From introduction: This report deals with the Middle and Upper Carboniferous System.
Date:
1891
Creator:
White, Israel C.
Object Type:
Report
System:
The UNT Digital Library