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An instruction piece, In Memoriam to Adriano Olivetti drew its inspiration from the Olivetti adding machines at the Air Force base. Is your product defective and the manual offers no solution? Go to a Repair Café for free repair services. Olivetti Gioconda Calculator · Olivetti Logos 20 Vintage Olivetti Underwood Summa Prima 20 Mechanical Adding Machine Vintage Olivetti Underwood 340 Calculator Adding Machine with Printer & Manual. olivetti adding machine, olivetti adding machine instructions, olivetti adding machine value, underwood olivetti adding machine, vintage olivetti adding olivetti adding machine, olivetti adding machine instructions, olivetti adding machine value, underwood olivetti adding machine, vintage olivetti adding In the few schools where such courses are offered , instruction is by lecture The center also has manual adding machines ( Facit , Olivetti , UnderwoodOriginal Instruction Manual for Olivetti Electrosumma 24 Calculators (like the example in the inset; adding machine not included).