Kestrel is a brand originating from England, but owned by the French Deltalyo. Kestrel is a known manufacturer of many different tools for bodywork processes, including polishing machines. The most known one is probably the Kestrel DAS6 DA polisher.
Menzerna is a Germany based manufacturer of industrial polishes, partly for the automotive detailing industry. Apart from manufacturing their own products, they also develop and manufacture products for others industrial companies.