Adams & Co. Legacy and Estate Services

Here is a highly collectible assortment of vintage technical calculators, trade charts, and slide rules dating back to the mid-to-late 20th century. These mechanical computing instruments were essential daily tools for engineers, electricians, and HVAC technicians before digital technology took over. This lot features a rich mix of specialized diagnostic, mathematical, and trade calculation wheels, sleeves, and rules—many branded by classic industrial companies. Featured Highlights in This Lot: • Alumid Professional Pocket Slide Rule: A vintage 5-inch engraved vinyl and magnesium slide rule (#12). Comes complete with its original red-and-white retail box and a custom Ontario Hydro stamped leather protective sleeve. • Airserco HVAC Equipment: Includes the Room Air Conditioner Calculator and the Trouble-Shooting Calculator inside its original yellow instructional envelope sleeve. • Electrical & Wire Trade Charts: Featuring a vintage Brady Wire Markers dispenser/booklet, Film-Coated Magnet Wire spec sheet (Canada Wire & Cable Co.), and multi-layered Square D Motor Data / Cable Calculators. • Specialty Calculations: Contains an Unbrako Socket Screw Calculator, Rain Bird Sprinkler Pipe Size & Pump H.P. Calculator, and an Electric Heating Selector wheel. • Bonus Measuring Tools: A vintage clear plastic Curtis Lighting Limited scale/ruler in its original packaging wrapper. Condition: Items range from good vintage condition to excellent. Paper and cardboard wheels move smoothly. Expect minor edge wear, aging, or light surface blemishes consistent with authentic field use by tradespeople. Please refer to the high-resolution photographs to evaluate the exact cosmetic condition of every piece in this lot.