Ritchie Tent and umbrella opener

PART OF:
45 models and samples submitted for US patents
Ritchie Tent and umbrella opener

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Ritchie Tent and umbrella opener
Science Museum Group
© The Board of Trustees of the Science Museum

Ritchie Tent and umbrella opener

Details

Category:
Industrial Chemistry
Object Number:
1989-225/33
type:
umbrella opener
credit:
Petersen, C.