L'innovazione e i brevetti

on
Concealable Bed System

Number: US20140047638A1

Date: 20/02/2014
Inventor: John Zimmer

 Bed lifting system
Number: US7757313B2
Date: 20/07/2010
Inventor: John Koorey
Font: https://patents.google.com/patent/US7757313?oq=bed

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