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| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
| lock. |
 |
| top: pin-tumbler cylinder lock |
| bottom: ships in the Miraflores Locks, Panama Canal |
| (Source: Precision Graphics) |
| (Source: H. Armstrong Roberts, Inc.) |
| (Photo: Geopress) |
| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. | |
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