devengaban
-they were earning
The word devengaban is the imperfect form of devengar in the third person plural.
See the full devengar conjugation

devengar

La OSSI comprobó que los saldos de las cuentas de la UNIKOM en los bancos locales no devengaban intereses, y recomendó que la misión estudiara otros arreglos bancarios para rectificar la situación.
OIOS found that the local bank balances of UNIKOM were not earning interest and recommended that the mission explore alternative banking arrangements to correct this.
Según Soro, las Forces nouvelles no devengaban un beneficio directo de la producción de diamantes y no estaban bien informadas sobre el embargo de diamantes y el sistema internacional de comercio de diamantes.
According to Soro, the Forces nouvelles does not extract direct benefit from diamond production and were not well informed about the diamond embargo and the international diamond trading system.
Tratándose de un caso en que se había declarado resuelta una parte del contrato, se estimó que los intereses se devengaban desde el momento en que el comprador había pagado las mercaderías comprendidas en la parte resuelta del contrato.
In the case of partial contract avoidance, it has been determined that interest is due from the time that the buyer paid for goods covered by the avoided portion of the contract.
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