Findings:
- Astra
- Astra (user)
- Per Ardua Ad Astra
- Astra 1220
- Ad Astra Per Aspera
- Astra 2C
- Per Aspera Ad Astra
- Opel
- Vauxhall/Opel engine identification conventions
- Adam Opel A.G.
- Robert Opel
- opel (user)
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