What does this placard mean on some Vienna's buildings?

score:5

This seems to be something used for surveying. The logo on top seems to indicate it's from a civil engineering company.

The scale looks very much like a level staff, so it's most probably used for some sort of height difference measurement.

I tried to look for projects this could be related to both on the webpage of the city administration survey service and the project website of the construction company, however, I can't find anything specific. It could be used for a construction project or to measure subsidence.

drat 12571

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Source: stackoverflow.com

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What does this placard mean on some Vienna's buildings?

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