Three line scanner for bar code symbols

Three variable reference chart and calculator

Ticket reader

Ticket reader and imprinter with bypass switch

Tidal depth calculator

Tide and time calculating device

Tide and time calculating device

Tide calculator

Time card computer

Time period calculator

Time-tape calculator

Time/speed/distance slide rule

Token-control

Transaction execution system with secure data storage and commun

Trigonometric slide rule

Two frequency coded data interpreting method and apparatus

Two-piece slide calculator for determining metabolic requirement

Universal funds transfer and identification card

Universal self-clocking code reading method and apparatus

UPC encodation verifier