The is an Otto four-stroke cycle engine of the type first built in the United States, shown in the National Museum in an undated photo. (AP Photo)

• Contributor: Associated Press / Alamy Stock Photo
• Image ID: 2NETK24
• File size: 20.2 MB (857.1 KB Compressed download)
• Releases: Model - no | Property - no
• Dimensions: 3001 x 2350 px | 25.4 x 19.9 cm | 10 x 7.8 inches | 300dpi
• Date taken: 7 October 2009
• Photographer: Associated Press

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This image could have imperfections as it’s either historical or reportage.

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