Bututun ƙarfe mara nauyi don hakar kwal
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Bututun ƙarfe mara ƙarfi don hakar kwal- GB/T 17396-2009
Bututun ƙarfe mara ƙarfi don ma'adinan kwal ana amfani da shi ne don kera bututu maras kyau
hydraulic prop a cikin ma'adanin kwal.
