Collection and disposal of oily waste and sludge from tanking cleaning operations Collection of marine slop and sludge
O.A.S. ELECTRICAL CONTRACTORS
OAKWELL DISTRIBUTION (S) PTE LTD
OGOO RECYCLE PTE LTD
OGSP ENGINEERING PTE LTD
OHIN CONSTRUCTION CO PTE LTD
OHM ENGINEERING PTE LTD
OIL SPILL SCIENCE SOLUTION
OKP HOLDINGS LIMITED
OMEGA CONSTRUCTION & ENGINEERING PTE LTD
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