Joint Ventures

Sharing global resources in product development and production technology.


A joint venture between ABC Technology Group USA and Jennmar Intermediate Holdings, LLC, Turnstone Industrial Solutions manufactures non-metal structural support systems, flexible ducting and semi-rigid polymer tubing products for mine and tunnel ventilation, industrial flexible ducting for temperature and environmental control, and rapidly-deployable air-stop seals and barriers. ABC Technology Group’s vertically-integrated manufacturing experience of high-quality ventilation products, along with the support of JENNMAR's and JENNCHEM's leading sales and service network, offers a comprehensive ventilation product line and application solutions throughout the USA.




ROCBOLT Resins, a joint venture between DSI Underground and JENNMAR, supplies a large proportion of the Australian and SE Asian mining & tunnelling markets with J-LOK Resin and Fasloc resin capsules. Through this joint venture, we have combined the resources and products of two of the world’s leading suppliers of quality mining, tunneling, and geotechnical solutions.



Falcon Drilling, LLC, a joint venture between Calandra Group and Falcon Drilling Company, is a Marcellus and Utica shale drilling contractor with an office in Carnegie, Pa., and satellite facilities around the area. The Board of Directors is led by Tony Calandra and Don Donahue.

Committed to their business areas, they employ a highly qualified local management team focused on solving Appalachian drilling challenges with proven results. With an impressive inventory of drilling rigs, their primary operating areas are in the Marcellus fairway in Pennsylvania, West Virginia, and Ohio.

At Falcon Drilling, safety is at the core of who they are. Their expert rig personnel are equipped with several extensive safety policies and certifications, renewed each year to ensure our employees are up-to-date on the latest safety procedures in the oil and gas industry.