From their post, it appears that Simula don't intend to comply with the subpoena. IANAL. Does receipt of these documents carry an obligation to provide the documents and deposition requested? Does this open them to later legal action if they refuse? It seems like a strange thing for a corporation to be able to demand that other companies hand over stuff like this, no matter the circumstance.
In this particular case it looks like they're just being asked to testify about their product in an unrelated case. They aren't being sued.
Call your lawyer first and do what they say. Most likely you can arrange a deposition more convenient to your schedule and location.