Original vintage oil and gas trade magazine ad for  LANDIS MACHINE COMPANY of Waynesboro, PA.  Large Casing Threads Tapped in 12 Minutes.  Baker Oil Tools, Inc. of Los Angeles reports that a Landis CBLM Circular Chaser Tap mounted on a Stamet's Vertical Tapping Machine has reduced threading time 75 percent.  Old 1953 petroleum industry equipment advertisement.