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NTSC - Wikipedia
What's the Difference Between NTSC and PAL? - How-To Geek
What are the NTSC, PAL, and SECAM video format standards?
NTSC vs PAL: What are they and which one do I use?
NTSC vs PAL - Difference and Comparison | Diffen
What Do NTSC and PAL Mean, and What Is the Difference? - MUO
Why NTSC and PAL Still Matter With HDTV - Lifewire
Ntsc | Encyclopedia.com
Television - NTSC, Color, Compatible | Britannica
PAL vs NTSC: A Detailed Comparison of Analog Video Standards