Original vintage oil and gas magazine ad for NL SHAFFER, of Houston, TX. NL Shaffer Spherical BOP's Outlast All Other Annulars. Industry tests sponsored by 21 companies and conducted by impartial experts have proved the NL Shaffer element to last as much as 10 times longer than other annular elements. Old 1977 petroleum industry, oil well drilling equipment advertisement.
- SKU o095
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