I have received an email from Bucker-Prado S.A. which says (paraphrasing):

Our founder Jesus Ballester (who is now 73 years old) has been suffering from heart and lung problems which make it difficult for him to work with his former efficiency.

For this reason, we have decided to sell the company, either completely or in parts.

If any person or entity is interested, they may contact us for the necessary information.

Bucker-Proado S.L.
This email address is being protected from spambots. You need JavaScript enabled to view it.

Jesus has also sent me a very interesting document "The Odyssey of the Tigre Engine" which contains the history and technical details of the engine. Please visit the "Downloads " page and look in the engines section so see the doc.