Patent ID: 7792890

Claim:
A calculator attachable to an external article attached to a user of the calculator comprising: (a) a calculator casing having a top end and an opposing bottom end; (b) electronic circuitry disposed inside the casing for computing mathematical calculations; (c) input elements embedded in the casing between the top and bottom ends, the input elements being electrically connected to the circuitry for inputting instructions to the circuitry when activated, the input elements having fixed input symbols disposed thereon; (d) an output element embedded in the casing adjacent the input elements, the output element being electrically connected to the circuitry for displaying input information and the results of mathematical calculations, the output element being adapted to display variable output symbols thereon; (e) an enclosable, rigid loop extending from the bottom end, the loop having an attachment mechanism for selectively attaching the calculator to the external article; and wherein the input elements, the fixed and variable symbols, and the output element are collectively oriented in a right-side-up orientation such that the fixed and variable symbols are readable by the user when the calculator hangs from the external article.