   
   Our History Our focus on innovation served as the foundation of our company. Richard Grover invented the first Permaseal interlocking joint in 1929. Even as we celebrate our history, we're looking for ways to serve you better. 1929-1965 With its superior sealing characteristics, Permaseal™ becomes the new industry standard by lowering costs for hydraulic cylinder manufacturers.  1966-1992Expanding our product line to accommodate compressor and transmission applications brings the same performance advantages to new industries. 1993-2003 Our company-wide commitment to lean manufacturing identifies new ways we can help customers improve quality and production efficiency. 2004 and beyond Today we’ve established a reputation as a global leader. And we continue to set new benchmarks for quality, efficiency and service.
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