>that's a very smart analog close-loop temperature control.
>Do you happen to know which company make these tools?

Weller have done it for more years than I care to remember (like about 40 
that I know of). The number stamped on the back of the tip is the tip 
control temp in 100 deg F. The normal tip to use is a 7, giving 700F, which 
is the nominal soldering temp. 

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