4. Chairs and seats
  5. Movable back
  6. Tiltable

P. L. Porter Company

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Anti-surge valve for hydraulic locking device

Brakes – Internal-resistance motion retarder – With means for locking parts together temporarily
Patent

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Coil spring or friction-lock mechanisms

Brakes – Rod
Patent

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Continuously adjustable stroke limiter for hydraulic positioner

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Predetermined discrete incremental adjustment positions
Patent

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Continuously self-compensating hydraulic positioner

Spring devices – Vehicle – Mechanical spring and nonresilient retarder
Patent

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Dual rotating mechanical lock

Brakes – Rod
Patent

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Profile ID: LFUS-PAI-P-445067

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