The one on the right is taller than the one on the left.
The taller one was still being assembled on 12th July but was earning its keep by 14th July.
The shorter one came as a surprise when I returned home on Sunday, having been assembled during my absence. 
The new buildings are already just nosing above the hoarding.
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Where does one get crane-operator training?
If I'd married the other bloke I could've asked his dad.