United States Patent 2652885
US Patent References:
/2142740.html
- - 2142740

Spring unit
- - 2217290

Seat and back cushion frame
- - 2251043

/2257633.html
- - 2257633

Spring structure
- - 2332041


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Primary Class:
267/103
Other Classes:
403/208
US Patent References:
2542458
Foreign References:
GB191228617A
GB416782A