美国零长弹簧公司（Zero-Length Spring Corporation）生产的贝尔雷斯（Burris）金属零长弹簧自动重力仪，是拉科斯特-隆贝格（LaCoste&Romberg）陆地重力仪的升级产品和重大改进。
This paper describes the automated Burris metal zero-length spring gravity meter produced by the Zero-Length Spring Corporation, USA, which is an upgrade of LaCoste & Romberg land meters.
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