AIREQUIPT STEREO THEATER, stereo viewer desktop stereo slide format 41 x 101 mm (Realistic, - Belplasca, - RBT). Eyepieces are focusable and adjustable interpupillary distance. 24 slides charger stereo with automatic feeding. Battery operation or mains transformer. Made in 1955 by Airequipt Manufacturing Co. in New Rochelle, New York.