Source: /cirosantilli/francois-and-joseph-blanc

= François and Joseph Blanc
{c}
{title2=Optical telegraph stock fraud}
{wiki=https://en.wikipedia.org/w/index.php?title=Optical_telegraph&oldid=1093157284\#History}

Very interesting story! A predecessor to <microwave transmission for trading>.

\Video[https://www.youtube.com/watch?v=cPeVsniB7b0]
{title=How The First Ever Telecoms Scam Worked by Tom Scott (2018)}
{description=Amazing how they used control signals to hide the information from officials on either side.}