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GPS Clegg Hammer type 4.5 Kg CIST/884 (Data Logging, Bluetooth and GPS) - Intec Marketing Services Sdn. Bhd.
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One, two, three or four: Does the number of Clegg hammer drops alter ground hardness readings on natural grass? - Dara M Twomey, Shahid Ullah, Lauren A Petrass, 2014
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