Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The present invention is a door barricade having a pivoting locking arm which drops into a floor hole to lock a barricade in place.
The present invention is a door barricade having a pivoting locking arm which drops into a floor hole to lock a barricade in place.
Door barricade
RICHMOND MATTHEW TODD (Autor:in)
26.02.2019
Patent
Elektronische Ressource
Englisch