This is a Washington 137W slackline yarder hoist mounted onto a rebuilt Washington 158 self-propelled carrier and telescoping 110' tower.

In all, 4 of the Washington 137W hoists were mounted onto the big 4-axle Washington carriers like this one- a neat-looking machine.
The owner was Pat Soderberg Logging and Construction of Kake, Alaska. Soderberg was a big logger in Alaska and a big Washington customer.

Photograph from the John Griffin Collection and sent to me in July of 2011. Many thanks to you, John!