This is an auction for Union Switch & Signal Company Bulletin #110 - "The Table Interlocker". It is a soft cover booklet measuring 6" by 9" and containing 16 interior pages. These use black and white photos, drawings and text to describe this remote control device for controlling outlying switches and signals. It is dated February, 1927. The booklet is in good vintage condition with light wear, but no condition issues. Winning bidder to add $5.00 s/h. Postage will be adjusted for winners of multiple auctions, whenever possible. I will accept a return of this item if I have failed to disclose or describe a significant flaw or significant damage in my item description. Thank you for looking!