<prompt> Translate the following text to SwahiliSuppliers that have offered catalyst for coal applications in the past but currently focus strictly on gas and oil -fired applications were not included.  <response>: Wauzaji ambao wametoa kichocheo kwa matumizi ya makaa ya mawe katika siku za nyuma lakini kwa sasa kuzingatia kabisa juu ya matumizi ya gesi na mafuta -fired hawakujumuishwa. 