Dear Razor we make our own what is of them, to the world nothing is created and nothing is destroyed, but everything is transformed, today versions of compressors or pre-compressors there is are a quantity, all similar to each other but not identical, from your experience and that of Panker, I think it is not difficult to appropriate modify or improve the same compressor, in order to develop a better one with your signature, it to be best than others and doing envy a all.
As I said before I also do not create anything for human nature (Read Signature), but transform and improve what already exists, and is a continuous cycle in the human nature, from the first steam train, till the last train a magnetic suspension.
I hope that you understood the meaning of my response.
Greetings and say hello to Panker.