perfected
131Bahá'í Faith and auxiliary language — Auxiliary language in the Bahá í Faith focuses on a particular teaching; that the world should adopt an international auxiliary language, and everyone should have to learn this language. The aim of this teaching is that the adoption of an… …
132Movietone sound system — The Movietone sound system is a sound on film method of recording sound for motion pictures that guarantees synchronization between sound and picture. It achieves this by recording the sound as a variable density optical track on the same strip… …
