I was unable to find a description of how the blanking periods worked in System 3. However, frustratingly, despite being the main citation, System 3 is not the CBS color system that was adopted in 1951! The first citation I could find proving this was this 1951 Radio and Television News article, transcribed here. But yes, this was a 144Hz system! Presumably that adjustment was made after 1942.
Момент удара ракеты по спутниковой станции в Израиле попал на видео20:56，更多细节参见safew
，这一点在谷歌中也有详细论述
// Nicely typed Vec
let (initial_values, mut stream) = vector.subscribe().sort_by(cmp);，这一点在WhatsApp Web 網頁版登入中也有详细论述
Стало известно о тюремном прошлом нового возлюбленного звезды Comedy Woman20:03