bellows
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As indicated in the title, please recommend several reputable manufacturers of bellows. We are currently using those from Jiangsu Chenguang, and their product comes with type test reports
I really don’t know. It was done many years ago.
I made one too many years ago, but it doesn’t show up now
Look for it. It should be inside the settings.
Jiangsu Chenguang is a leading domestic enterprise in the bellows industry; its quality is excellent. The downsides are its high cost and uncertain delivery times