4. Seal for a joint or juncture
  5. Seal between relatively movable parts
  6. Piston ring or piston ring expander or seat therefor

David Woodroffe

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Number wheel counters

Registers – Transfer mechanism – Differential gears
Patent

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Seal arrangement providing a seal between a bore and a rod movab

Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Patent

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Seal arrangement providing a seal between a bore and a rod...

Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Reexamination Certificate

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