4. Geometrical instruments

Donald E. Trott

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Automatic closing gate

Movable or removable closures – Treadle or impact initiated operator
Reexamination Certificate

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Automatic coupling and decoupling apparatus

Geometrical instruments
Patent

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Casing perforation method and apparatus

Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent

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Casing perforation method and apparatus

Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent

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Casing perforation method and apparatus

Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent

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