I’m blogging this for the name “Chinook saw”.
This was a mystery we discussed 16 years ago on the CHINOOK listserv.
The phrase “Chinook saw” turns up in the Thompson River Salish dictionary, as the English gloss for a Salish term mnuʔsáqs tk nx̣aʔƛ̓ús. (Literally something like ‘the both-ends scalloped-faced-thing’.)
Now that the internet has matured some, I’ve located images of the real hot item.
It’s a trade name: the Simonds “Royal Chinook no. 503” crosscut saw. (Simonds is still in business.)
I imagine “Chinook saw” meant that the tool ripped through a log like the famous Chinook wind eats up the snow in an eyeblink.