Original oil and gas trade magazine vintage ad for SHAFFER TOOL WORKS of Brea, CA. Every Well in Kettleman Hills is Using Shaffer Equipment. Pictured is Associated Oil Company's No. 1 Whepley well in the Kettleman Hills Field, California, Equipped with Shaffer High Pressure Equipment. This unique 1931 old petroleum oilfield drilling equipment magazine advertisement would display beautifully matted and framed.