Check the listing for details. VTG BEAM SPAN COMPUTER Calculator Paper Slide Rule Structural Engineering USA. Condition: Used, Made in United States. Listed at 19.99 USD. Made in USA by Western Wood Products Association of Portland, Oregon. Extra flip-out panel. Please see photos for condition and measurements. Any additional objects in photos intended to show scale, such as rulers or coins, are not included with purchase. Shipped from our smoke-free home. We're committed to careful packaging so your purchase arrives safely. Happy to combine shipping with other same-day purchases from our store -- please message us if you haven't done that before and we'll give you a hand. International buyers, please be aware that any locally-import taxes, customs fees, or tariffs are not included in the shipping price, so please budget to pay those on your end! Returns within 30 days; questions welcome!