Caterpillar was able to deliver this design in 18 months after the product development was started.
Caterpillar was only able to deliver the design 2 years after product development for it began.
mnli hypothesis: Caterpillar was only able to deliver the design 2 years after product development for it began. premise: Caterpillar was able to deliver this design in 18 months after the product development was started.