· that engage in use with upper faces ofthe topmost rooffles (12) on either side of an apex (4)...

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Page 1:  · that engage in use with upper faces ofthe topmost rooffles (12) on either side of an apex (4) of aroof(6) , which (42) define a ventilation opening (41) between the ridge files
Page 2:  · that engage in use with upper faces ofthe topmost rooffles (12) on either side of an apex (4) of aroof(6) , which (42) define a ventilation opening (41) between the ridge files