"during their operation" is a correct and usable phrase in written English.
It is typically used to indicate a period of time in which a specific action or event is taking place. Example: The firefighters were able to rescue all of the residents of the burning building during their operation.
We expect that the sensors will be operated partially depleted during their operation at the LHC and we have implemented an n+ on n sensor design.
Programmable machines are often capable of making decisions during their operation.
The city also inspects tower cranes before they are erected, at key times during their operation, such as when sections are added to make them taller, and in response to complaints about unsafe operations.
during their operation (over time).
Many elements of structures are subject to dynamic loads during their operation.
The railway axles are subjected to cyclic loading during their operation.
Nevertheless, small-scale miners risked direct exposure to the Hg during their operations, especially from dermal contact (galamsey operators directly handled Hg in their palm this was observed during the field visit) (Fig. 3).
(Mobiles are occasionally used as detonators for explosives, and, more commonly, for communications among militants during their operations).
Coal mining companies will be taxed for so-called fugitive emissions, or gases that escape naturally during their operations.
I call upon you to protect these heroic fighters and not give the invaders any information about them or their whereabouts during their operations, to stop giving names or any true information about them.
In Barwana, a pleasant huddle of hilltop and riverside hamlets, commerce has been strangled since the marines closed the border with Syria during their operations last year and destroyed several bridges to restrict their enemies.
