Combined level, plumb rule, and clinometer

• 1. 一种可辅助铅垂的水准尺 [P] . 中国专利： CN206488774U . 2017.09.12
• 2. 建筑钢模板铅垂尺 [P] . 中国专利： CN105466392A . 2016-04-06
• 3. An Improved Level Indicating Instrument applicable also for use as a Clinometer and Plumb Rule [P] . 英国专利： GB190309102A . 1904-02-11

  机译： 一种改进的液位指示仪，也可用作测斜仪和铅垂尺

• 4. Combined clinometer, plumb, and level [P] . 美国专利： US1481716A . 1924-01-22

  机译： 组合式倾斜仪，铅锤和水平仪

• 5. Improvements in combined plumb-rules and levels [P] . 英国专利： GB388866A . 1933-03-09

  机译： 改善铅垂规则和水平

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• 8. ORAL QUESTION (0-21/83) with debate pursuant to Rule 42 of the Rules of Procedure by Sir Henry PLUMB, and Mr PATTERSON on behalf of the European Democratic Group, Mr ALBER and Mr BROK of the Christioan Democratic Group (EPP), Mr BANGEMANN and Mrs NIELSEN of the Liberal Group, and Miss DE VALERA of the Group of European Progressive Democrats to the Commission of the European Communities Subject: Progress on the "Vredeling" Directive. Working Documents 1983-84, Document 1-601/83, 7 July 1983 [O] . 1983
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