From Halopedia, the Halo wiki
Dasuss is a manufacturing company that creates vents, escalators and possibly other devices. Their logo can be seen often printed on their products.
Escalators from Dasuss were used in the Quito Space Tether. The NMPD headquarters in New Mombasa also had Dasuss devices in it. Before it was glassed by the Sangheili Fleet of Retribution to stop the Flood infection, Traxus Heavy Industries used the products of this company in the Traxus Factory Complex 09 in Voi.
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