But it took 20 years of effort to gather them all

2013-12-31View Original

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Animation of control valves; it needs to be downloaded from the Internet. I spent 20 years gathering these materials – I’m sharing them so that both you and I can benefit from them

Reply #22016-11-22

111111111111111111 You know what I mean

Reply #32016-12-01

Does the poster mean that one’s efforts shouldn’t go to waste?

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But it took 20 years of effort to gather them all

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