My walk yesterday took me to this, one of Seattle's more obscure museums.
It's only open on Tuesday mornings, and is a bit difficult to find (it's located in part of a US West colocation facility and has no signage visible from the main street it adjoins). However, this museum contains some remarkable artifacts from the early days of the telephone, and stands above similar museums in that a team of volunteers actually keeps most of this long-obsolete equipment (including ancient phone company switching devices and teletypes) in perfect working order.
Apparently these were the notes maintained by the engineer responsible for maintaining the manual teletype hub which would connect Seattle-area Associated Press subscribers (e.g. local newspapers) and other teletype customers with their service providers. The piece of equipment these notes were for required the operator to manually move cables to connect subscribers with providers, and was in use until 1988.