Vintage Unisonic 737 "Slide Rulette" electronic calculator. Based on the information available, here are some key details about it: * Model

Model

737 Slide Rulette

Brand

Unisonic

The Unisonic 737 is a vintage handheld electronic calculator produced by Unisonic Products Corporation, an American consumer electronics manufacturer that operated from the 1970s to the 1990s. Here's a breakdown of its key features and historical context: Features: * Type: Handheld electronic calculator, often referred to as a "pocket memory calculator" or "Slide Rulette." * Date of Manufacture: Circa 1974. * Display: It typically featured a green vacuum fluorescent display (VFD) with 8 digits. * Keys: It had an array of about twenty to twenty-five square plastic keys, including: * Ten digit keys (0-9) * A decimal point key * Four basic arithmetic function keys (+, -, x, /) * A total (equals) key * A percentage (%) key * A clear (C or CE) key * Memory keys (often two) * Power: It was powered by four AA batteries and also had a jack for an external power supply. * Design: It typically had a metal and plastic case, and some versions featured a decimal point switch (floating decimal, two, or four digits) and a subtraction summation switch. History and Context: * Unisonic Products Corporation: Unisonic was known for outsourcing its manufacturing to East Asian facilities (Japan, Hong Kong, South Korea) while being headquartered in New York City. * Early Calculators: The Unisonic 737 was part of a wave of early portable electronic calculators that emerged in the 1970s. These devices capitalized on advancements like Large Scale Integration (LSI) and Integrated Circuits (ICs), making calculators small enough to compete with traditional slide rules. * "Slide Rulette" Trademark: Several of Unisonic's early calculators, including the 737, bore the "SLIDE RULETTE" trademark. This was a marketing strategy to instill confidence in buyers, suggesting that these new electronic devices could perform the functions of a slide rule with greater precision and ease. * Market Position: The Unisonic 737 was typically marketed as an affordable "pocket memory calculator," with advertisements in the mid-1970s pricing it around $60-70. * Collectibility: Today, the Unisonic 737 is considered a vintage collectible, sought after by enthusiasts of early electronic calculators.