Just to open up another can of worms...Bernard Levine himself once admonished me: There is no such thing as a Half-Congress. A Congress knife can have two blades, or four blades, or even six blades, but a two blade Congress is not a Half-Congress.
Unless you are talking about a "Carpenter's Whittler"
Which is a clip/coping/clip in a Stockman configuration.
I hope you understand that I point these things out not to be argumentative, but because I enjoy pedantry and semantics.
All in good spirit, I hope.