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Load-indicating Attach For Drilling Rigs Patent Print - White

Load-indicating Attach For Drilling Rigs Patent Print - White Patent Title: Load-indicating Attachment For Drilling-rigs Inventor...read more

Load-indicating Attach For Drilling Rigs Patent Print - White Patent Title: Load-indicating Attachment For Drilling-rigs Inventor Name: Howard R. Hughes Year Issued: May 16 1916 Item Number: 11291 Reprint of original Patent Patent is print...

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