These houses are separately two houses, (two different units) not a single house!, I know this area well.
So, each house has a unique addr_number.

Regard to generator, there are only one generator, I visited this building and it has only one generator, (so its duplicated sign), I have a photo picture but can not shared due to personal privacy.

Hi,
for this:
way/862549100/history
I don't removed these tags, I reviewed my edit and I may be done by mistake, I apologize for that.

for this:
node/10870872904/history , and node/10870870891/history

Yes, I removed correctly, because its duplicated addresses.

For Generator: Yes, I deleted because it duplicated sign also, You can check it out.

For comments: Yes, You are right, I'm negligent in commenting sometimes !

regards