When overhauling existing equipment, a project can come to a halt when an item is obsoleted by the manufacturer.
This is what happened when a German company needed a replecement instrument for a low-flow oil-measurement.
In the machine that was being upgraded, the motor-control would only release the main motor after it is ensured that the main-bearing lubrication oil-flow is effective.
This oilflow was originally monitored by an SKF GS300 flowmeter, which unfortunately is no longer available in the market.