Mission Critical modifier

[tushaw]

"Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become precisely the opposite, a tool for communicating with a large, public audience."

Question:

Does "that" in the above sentence refer to "tool"? In this case "for private conversation" would serve as a mission critical modifier right?

[tim]

sounds like you've got a correct understanding of this one..