A manhole 2*22

A manhole cover with a scheme that represents an example of pattern of type 2*22.

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A manhole cover 4*2

A manhole cover that has symmetry of type 4*2. You can see also this other photo.

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A manhole cover 22*

A manhole cover that has symmetry of type 22*.

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A manhole cover 22*

A manhole cover that has symmetry of type 22*.

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A manhole cover 22*

A manhole cover with a 22* symmetry type. You can see also a detail.

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A manhole cover *442

A manhole cover with a *442 symmetry type. You can see also a detail.

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A manhole cover 4*2

A manhole cover that has symmetry of type 4*2.

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A manhole cover 4*2

A manhole cover with a 4*2 symmetry type.

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A manhole o

A manhole cover that has symmetry of type o.

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A mark D4

The coat-of-arms of the town of Pisa, in a man-hole cover, is an example of a rosette with...

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