DOOR CHAIN OPERATING ALSO AS VENTILATOR
Document Type and Number:
Japanese Patent JP11141213
To operate a door chain as a ventilator in addition to its inherent function.
A movable connection bar 2 with restrictions is provided in a prop 1a and a prop 1b.
May 25, 1999
November 06, 1997
E05C17/06; E05C17/00; (IPC1-7): E05C17/06