p iv bis, aviation

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P-IV bis, 1920 during World War I

P-IV bis, 1920 Public domain photograph - aircraft, aviation, free to use, no copyright restrictions image - Picryl description

P-IV bis, 1921 during World War I

P-IV bis, 1921 Public domain photograph of experimental aircraft, prototype, aviation design and development, no copyright restrictions image - Picryl description