The close of WWII found a young William G. Gudgeon working as a Pattern Maker in London, Ontario, Canada.  His 3 brothers, Art, Ted and Jack returned from the war and were trained for the Pattern Making trade and Gudgeon Brothers Ltd. was formed in 1949. 

The boys were darn good pattern makers and they specialized in tooling for shell core and molding. As the business evolved they started to become involved with a new foundry process; chemically bonded sand molding and core making. Gudgeon Bros Ltd were appointed as the exclusive Canadian agents to promote Fordath No-Bake Foundry Equipment in the early 1960's. A relationship with Shalco Shell Core Equipment was also established to promote shell molding and core making machines.   

The company was very successful and they introduced the chemically-bonded molding process from coast-to-coast in Canada capturing the continuous mixer, core making and mechanically reclamation market for over 2 decades. 

The sons of William G. Gudgeon joined the Company with Brent starting in 1978 and William joining in 1982. The first generation of Gudgeon Brothers gradually retired from the company as the second generation came on-board. William Sr. remained as President until 1998.

During the 80's Gudgeon Brothers worked with Fordath's old thermal sand reclaimer It was an expensive, high maintenance machine that was in repair mode as often as it was in operation. Thermal sand reclamation was an exotic option for foundries and the Gudgeons wanted to develop a machine that was compact, unique in design with a low thermal mass, fuel efficient, easy to maintain and affordable. 

Out of this ambition Thermfire was born. The Company invested in a prototype and installed it in their London plant. It was a small, stacked bed thermal reclaimer that required 3 years of development to take it from a concept to a prototype. 

The jump from prototype to commercialization of the Thermfire was made in 1991 with a 3000 lb/hr thermal reclaimer sold to Cunningham Foundry in St. Catharine's, Ontario, Canada. Other orders followed and GTI Inc. learned the intricacies of building thermal reclaimers  for iron, steel, aluminum and magnesium foundries that were using the entire spectrum of no-bake, chemically bonded binder systems. Today there are over 100 Thermfire systems operating all across North America, South America and India.