SONAR TRANSDUCER COMPUTER SLIDE RULE EDO Corporation Vintage Slide Chart by Perrygraf. Invented by George Rand! College Point, Long Island New York. I will combine shipping on any order. Be sure to add items to cart before making purchase. * Buyer terms and conditions:Please view all photos and read the description before asking questions.If you see an error in the description, please contact me so I can correct it.Items are packed properly to prevent damage in transit (see my feedback).I always show known flaws or imperfections (if there are any).Returns and any refunds are subject to a 25% restocking fee.The restocking fee applies to paid un-shipped, canceled orders as well.All sales are final.No buyer’s remorse returns allowed. No returns if you “change your mind”.Payment is due within 24 hours of ending or item may be relisted.Items are described accurately and NEVER drop-shipped.I occasionally recycle once-used boxes from Amazon and other retailers. Boxes are clean, sturdy and reduce shipping costs. (I don’t sell on Amazon or buy items from Amazon)All images are protected by U.S. copyright laws and may not be used for any other purposes. Track Page Views With Auctiva's FREE Counter