Original hardware trade vintage catalog for MANDIST INC. Visco Products Division. Main office was located in Providence, RI. Manufacturers of Dubl-Chek weatherstrip. Astrogal allows no visible light between the door regardless of how tightly or loosely the doors fit. Components, applications, action and details provided. Automatic weather stripping. This unique 1962 old four page building construction brochure would be a marvelous addition to your retro architectural design and engineering library. Pages are loose and contain small amount of residual glue on edge.