Kilroy was...a bandpass filter?

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Anyone remember Kilroy, the WWII graffito, who "was here?"

Kilroy_Was_Here.jpg

Anyone remember what a bandpass filter might look like?

KilroySchematic.png

Just some fun I found while researching the author Thomas Pynchon. Got it from Wikipedia fyi.
 
Yep, back in high school in 1978 or so. And it took me forever...but I loved it. You? But I don't remember Kilroy from that book, though it may well have been there. I do remember the underground postage symbol from Crying of Lot 49 though.
 
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