1951 Lincoln All Season All Weather Comfort Sales Folder with Installation Instructions. Tune in Year 'Round (Comfort, Health, Safety) with your Lincoln Fresh-Air Heating and Ventilating System. In Winter...tune in Pleasant Warmth...and Safety. In Summer...enjoy Positive, Fresh-Air Ventilation. Back of Folder shows how the Heating and Ventilating System Works. Installation Instructions for Fresh Air and Recirculating Air Heater and Defroster Unit (No. 1H-18455-A) on 1951 Lincoln Cosmopolitan Passenger Cars included. Condition: Looks like a bit of red crayon scribble on cover of folder. See pics.