A tool with a dinging or striking head; possibly a historical metalworking or construction tool with repeated striking capability.
Compound of 'ding' (to strike with a sound) and 'maul' (a hammer or heavy tool). This appears to be specialized vocabulary from trades like blacksmithing or stonework.
Blacksmith and construction vocabularies are treasure troves of specific tool names that tell us exactly how the work was done—'dingmaul' suggests a tool used with repetitive striking motions.
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