More interesting manhole covers...

Some more decorative manhole covers on the the sidewalk, this time from Nagoya (名古屋）...

Nagoya fire hydrant water supply. (名古屋市　消火栓)

This one looks like a valve for Toho Gas.

This next one, however, I don't know about....

Interesting design-looks like a water bug. So I imagine it must be Nagoya city water supply. 

Anybody know?  

I've never seem more of these detailed manhole covers than in Japan. They're everywhere!