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Image:Tek 555 21 trigger.png|Type 21 trigger | Image:Tek 555 21 trigger.png|Type 21 trigger | ||
Image:Tek_555_block.png|block diagram | Image:Tek_555_block.png|block diagram | ||
File:Tek 555 crt circuit.png|CRT circuit | |||
File:Tek 555 crt1.jpg|CRT | File:Tek 555 crt1.jpg|CRT | ||
File:Tek 555 crt2.jpg|CRT | File:Tek 555 crt2.jpg|CRT |