Liaocheng (Chinese: ; pinyin: Liáochéng), is a prefecture-level city in western Shandong province, China. It borders the provincial capital of Jinan to the southeast, Dezhou to the northeast, Tai'an to the south, and the provinces of Hebei and Henan to the west. The Grand Canal flows through the city. .
People's Republic of ChinaIn August 1949, Liaocheng was detached from Shandong and attached to . In November 1952, Pingyuan was dissolved and. .
Liaocheng is a of the following cities:• , , South Korea (since June 7, 2001)• .
• Shanxi-Shaanxi Assembly Hall (short Shanshan Hall, : ; : Shān–Shǎn Huìguǎn)• Guangyue Tower (; Guāngyuè Lóu)• Iron Tower• Lion. [pdf]
A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. [pdf]
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