Help with attribution
 

That such work.
Size - 28h38 cm
help to read the signature.

German like ... Or Belgian.

Although hell knows.

It seems our work. Guys-our. "I wonder what they are doing?". Handwriting - ours. 1935. The first letter of the name - "H or B?", First letter of the name - "K"? ", The last" t "?. Look at the board

Judging by the negligence of a signature - it is quite mb and "our".

I think they put the famous concrete tiles, which lies on the sidewalks in all cities in Russia, rather dolezhivaet, now its guest workers are almost all changed. And the way to laying a very native :D
And the people of the herd. Subbotnik or trips.
Somewhere in the West, but in 85 th year, this certainly was not done in such a herd, in overalls and with the use of any special equipment.
And the cap is native ":D

The two comrades aprons "without breast"? It's hot, however, but on the street does not look as though a lot of daylight. Q

Furnace for heating bitumen - in the background. These ovens are not put in the room - will have nothing to breathe. Buckets pour this bitumen. Some waterproofing is done (pool? Basement of an unfinished house?), But still on the street.

So laid asphalt on small plots.

Poured a bucket, the board is spread.

In the background is a kind of stove, boil the bitumen may then poured a bucket to the right place.
Hence, the vapor-smoke, heat ...
But not a roof, probably in the shop flooring change.
Actually, this seems like a sketch to a large student work.

As such, as you have photos, as you have seen yourself, say something difficult. For example, the ending can be read as a "dr", and with the same probability as "eim". Facilitate our task, give a more precise (in terms of interferences in focus) and a large photograph signed. The best way to do it on the scanner at least 300 dpi.