2018-08-302022-02-022018-08-302022-02-02https://hdl.handle.net/11124/172499Date of manufacture: 1977.The HP-55 programmable calculator came out a year after the HP-67 for a much lower price. It only had 49 lines of program memory (as compared to the HP-67's 224 lines). It did however offer twice as many storage registers, more pre-programmed functions, and a quartz-controlled timer. Today's price (2011) adjusted for inflation, would still be formidable $1,420.born digitaldigital photographsCalculatorsImage