method and device for regulating the depth of penetration of a tractor drawn plough

• 1. 一种拖拉机牵引具播种绿肥喷施菌肥新型犁具 [P] . 中国专利： CN103355017A . 2013-10-23
• 2. 拖拉机牵引耕地犁 [P] . 中国专利： CN201146670Y . 2008.11.12
• 3. method and device for regulating the depth of penetration of a tractor drawn plough [P] . 德国专利： DE000001557701A . 1970-04-02

  机译： 拖拉机牵引犁的穿透深度的调节方法和装置

• 4. method and device for regulating the depth of penetration of a tractor drawn plough [P] . 德国专利： DE000001931695A . 1970-05-21

  机译： 拖拉机牵引犁的穿透深度的调节方法和装置

• 5. method and device for regulating the depth of penetration of a tractor drawn plough [P] . AT262671B . 1968-06-25

  机译： 拖拉机牵引犁的穿透深度的调节方法和装置

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• 4. Design of Full-Ocean-Depth Self-Floating Sampler and Analysis of Factors Affecting Core Penetration Depth [J] . REN Yugang, LIU Yanjun, DING Zhongjun, 中国海洋大学学报（英文版） . 2020,第005期
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• 6. Measurement of weld penetration depth using non-contact ultrasound methods. [D] . Kita, Akio. 2005
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• 8. Report drawn up on behalf of the Committee on Economic and Monetary Affairs on proposals from the Commission of the European Communities to the Council on the elimination of technical barriers to trade in particular, proposals for directives on the approximation of laws of theMember States relating to:safety belts and restraint systems and head restraints of seats of motorvehicles (Doe. 464/74);headlights for motor vehicles emitting an asymmetrical passing beam or adriving beam or both, and to incandescent electric lamps for suchheadlights (Doe. 452/74);side lights, rear lights and stop lights for motor vehicles and their trailers(Doe. 457/74);the rear registration-plate illuminating device of motor vehicles and theirtrailers (Doe. 450/74);towing hooks on motor vehicles (Doe. 462/74);the roll-over protection structures of wheeled agricultural or forestrytractors (Doe. 456/74);the type-approval of motorcycles (Doe. 463/74 );alcoholometers and hydrometers for alcohol and alcohol tables(Doe. 406/74);electromedical equipment and medical X-ray equipment operating at 10to 400 kV (Doe. 453/74);common provisions for constructional plant and equipment; themeasurement of the sound level of constructional plant and equipment;the permissible sound level for pneumatic concrete-breakers andjackhammers (Doe. 454/74); 'appliances using gaseous fuels, safety and control devices for theseappliances and methods for inspecting these appliances and appliancesusing gaseous fuels for the instantaneous production of hot water forsanitary purposes (Doe. 459/74). Working Documents 1974-1975, Document 517/74, 10 March 1975 [O] . 1975
• 9. Development of a Tractor-Drawn Implement for Digging and Forming Raised Beds. Final Technical Report [R] . Meyer, E. W. 1982

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