4. Chairs and seats
  5. Back movement resiliently opposed in operating position

Yaacov Kaufman

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Ergonomic chair

Chairs and seats – Back movement resiliently opposed in operating position
Patent

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Folding chair with continuously variable self-balanced tilting a

Chairs and seats – Collapsible chair; i.e. – relatively folding bottom – back,... – With means to hold chair in plural operative configurations
Patent

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Joint and method of utilizing it

Joints and connections – Selectively assembled – e.g. – convertible – etc.
Patent

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Profile ID: LFUS-PAI-P-1367763

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