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I think that we should use and join this 2 method
1. using the forward and backward of the black plate and telescope as shown in Pic 1 and 2.
And The result of the signal will be shown as in the pic 3. Which is the same picture as in unintentionally sending
2. Expanding and shrinking the black plate like open and close an umbrella.
Related Link
Blind Corner
Telescope's Position
Unintentionally Sending
First Signal
Replying
