windowbox (film) wikipedia - EAS
28 mm film - Wikipedia
History of 28 mm film Pathé Frères. Main article Pathé Frères. Pathé Frères was founded by brothers Charles and Émile Pathé. The company had two divisions, a phonograph and a cinema portion, which were established in 1894 and 1896 respectively. Within fifteen years of its establishment, Pathé Frères was arguably the largest entertainment company in the world.
Letterboxing (filming) - Wikipedia
Letterboxing is the practice of transferring film shot in a widescreen aspect ratio to standard-width video formats while preserving the film's original aspect ratio. The resulting videographic image has mattes (black bars) above and below it; these mattes are part of each frame of the video signal. LBX and LTBX are identifying abbreviations for films and images thus formatted.

