This code appears to be for internal factory use, perhaps to trace various batches of tubes.

此代码似乎是厂家内部使用，也许是为了跟踪不同批次的管子。

youdao

This code appears to be for internal factory use, perhaps to trace various batches of tubes.

此代码似乎是厂家内部使用，也许是为了跟踪不同批次的管子。

youdao