Use of concrete masonry goes back to various times within the 19th century but as early as 1900 Harmon Palmer began manufacturing hollow core concrete building block in the United States. Since then the industry has seen major changes in the size, shape, texture, appearance and use of concrete masonry. Today they are used in virtually every type of building construction to include commercial and residential buildings, paving and retaining wall landscape projects. Browse the project categories below for a sampling of the broad use of these materials in many applications.