Sales efforts were expanding quickly and included the Eastern and Western U.S. and Canada. CMM's reputation as a quality chain manufacturer continued to grow, and in 1938 CMM developed and patented the Duplex Chain, which became the company's dominant product throughout the 1940's.

The early 1950’s brought the development of the Rap-Lok continuous miner which had five or six chains running over the machine head. The 125 and 405 type chains incorporated the Rap-Lok and each merited a patent of its own.

By the mid-50’s, the company was selling more than 12,000,000 bits per year for this chain. Each month, 120 tons of steel rods were cut to specifications using machines designed by CMM.Significant product innovations included the 414 trim chains for use on boring machines.

Our innovative conveyor chain design was first tested at the Duquesne Light Company coal mine. This chain, which incorporated the universal connector developed and patented by CMM, continues to be widely recognized as the strongest chain available.

Innovative and patented designs were introduced in rapid-fire succession during the 1970’s. Robert Stenger, the company’s current President and grandson of Edwin P. Stenger, joined CMM in 1972. Shortly thereafter, Ron Paolello and Tim Jent, our current General Manager and Manufacturing Manager, came onboard. During this period, projects such as the 814 Ripperveyor chain, for the JOY 11CM miner, and the 734 chain, for the Jeffrey Heliminer 120-H machine, were developed.

These two chains, in particular, represented significant advancements, both for CMM and the miners, who immediately achieved higher productivity and longer service life.

Within this same time period, the Pin-On bit lug was developed and patented. This product represented no less than a revolution for the coal industry because it allowed the fast and straightforward replacement of the bit holder to the exact bit location without the need to burn off the existing lug and weld a new one in place.

The patented Cone-Tite holder, with the holding device at the rear of the lug, was also developed during this time. This impacted the coal industry dramatically, as most bit holders in use today are a variation of this important and innovative design. Shortly thereafter, CMM brought to market the Cone-Lok, an advanced version of the Cone-Tite bit lug and base combination.

With the addition of William Stenger, Treasurer and Randy Morris, Chief Engineer, we enhanced our current senior staff.

In 1999, after enjoying more than 60 years of business in South Africa, we opened our own office and distribution facility in Witbank South Africa. In 2002, we opened a warehouse in Chapmanville, WV, to better service our customers in that area. This added to the other warehouses spread throughout the U.S., Canada, Australia, Mexico and Europe.

Cincinnati Mine Machinery Company has been admired and respected as an innovative, quality-driven company that could meet the challenges of the day. Today, that reputation continues to serve us well as we strive to maintain leadership in what is certainly a challenging competitive climate. In addition to North America, the U.K., Australia and South Africa, our service area now includes the growing areas of South America and Europe.