John E. Nelson

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Adjustable straight edged device for use with drafting board

Geometrical instruments – Straightedge type – Base attached
Patent

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Apparatus and method for remotely installing shoulder in...

Wells – Submerged well – Connection or disconnection of submerged members remotely...
Reexamination Certificate

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Apparatus and method for the optical detection of multiple items

Registers – Coded record sensors – Particular sensor structure
Patent

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Artist's work and storage station

Supports: cabinet structure – With drafting board
Patent

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Casing hanger seal assembly with diverging taper

Wells – Expansible anchor or casing – Liner hanger
Patent

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Profile ID: LFUS-PAI-P-206756

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