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One part of it looks like a lightning bolt. In fact, the same symbol is used on all of the "Inventors" stamps from the Famous Americans Series (Scott 889-893).
What does that symbol represent?
Puzzler replied:
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Are all of the kind of monogramed symbols, laid over one another in a way, symbols of the different societies that inventors and scientists might belong to?
The cogged wheel would be the mechanical engineers or even machinists, while the lightening bolt representing the electrical susyems or engineers and the grain some sort of society that represented the farmers or envestigators of biology and/or lining plants?
Actually, that's not too far off.
AND THE ANSWER IS...
The symbols are:
(1) Cogwheel;
(2) Uplifted Wings; and
(3) Lightning Flash
And the meaning is:
(1) Power;
(2) Flight; and
(3) Electricity
It's documented here:
