Hi,
I read somewhere in this forum that the air-lock joint was actually created and patented by chinese.
Does it mean that each cue make who uses air-lock joint need to pay for a fee for this including manufacturers such as Omin etc ?
How does this system work? Thanks in advance.......just curious to know.
I read somewhere in this forum that the air-lock joint was actually created and patented by chinese.
Does it mean that each cue make who uses air-lock joint need to pay for a fee for this including manufacturers such as Omin etc ?
How does this system work? Thanks in advance.......just curious to know.
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