| http://www.w3.org/ns/prov#value | - th a ventilator made according to my invention applied thereto; Fig. 2 is a cross-section of my invention taken substantially along the line 2 2 of Fig. 1; Fig. 3 is an isometric view of my invention with the screen thereof retracted within the casing; Fig. 4 is a view of a metal plate adapted to be secured to one of the jambs of the window for the purpose of engaging within an opening in a metal
|
