| 1951 | M Tech Air Con & Security Engineering Pte Ltd
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| 1952 | M Bina Construction
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| 1953 | Merlin Renovation And Aluminium Works
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| 1954 | Mao Sheng Quanji Landscaping Design Pte Ltd
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| 1955 | Mac Construction & Trading
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| 1956 | Maxtop Electrical Contractor
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| 1957 | Mst Engineering Pte. Ltd.
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| 1958 | Meng Nguan Electrical & Services
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| 1959 | Mdb Technologies Pte. Ltd.
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| 1960 | Milworks Solutions Pte. Ltd.
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| 1961 | Maxim Controls & Heating Equipment
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| 1962 | Mp Plumbing & Sanitary Pte. Ltd.
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| 1963 | Mactech Engineering & Trading Pte. Limited
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| 1964 | Mahalakshmi Electrical Engineering
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| 1965 | Maxpower Engineering & Construction
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| 1966 | Mitra Bahtera Segarasejati Pte. Ltd.
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| 1967 | Metric Engineers Pte. Ltd.
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| 1968 | Memiontec Pte Ltd
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| 1969 | Mes Electrical Engineering Pte. Ltd.
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| 1970 | Metrohm Singapore Pte Ltd
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| 1971 | Marvid Int'l Pte Ltd
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| 1972 | Mrk Engineering Pte. Ltd.
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| 1973 | Mti Projects Pte. Ltd.
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| 1974 | Multi Attributes Pte. Ltd.
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| 1975 | Metalcool Pte. Ltd.
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| 1976 | Mediamac Pte Ltd
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| 1977 | Millennium International Builders Pte. Ltd.
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| 1978 | Man Hong (s) Pte. Ltd.
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| 1979 | Mage Jheel Engineering Pte. Ltd.
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| 1980 | Mastron Pte. Ltd.
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