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1. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No, 200C-842, Patterson Constr. Co., Contractor


	CN-12-201-255NA Klamath Project - Oregon-California. View of Laser Beam receiver unit mounted on trencher; November 1972; Bureau of Reclamation photo by D. W. Stein
	Citation Citation Citation Abstract Copy Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No, 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1972, 2009, 2007 CN-12-201-255NA Klamath Project - Oregon-California. View of Laser Beam receiver unit mounted on trencher; November 1972; Bureau of Reclamation photo by D. W. Stein Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No, 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1972, 2009, 2007 CN-12-201-255NA Klamath Project - Oregon-California. View of Laser Beam receiver unit mounted on trencher; November 1972; Bureau of Reclamation photo by D. W. Stein

2. [Image] Closed Drain Construction - Tule Lake Sump 3 – Specs. No. 200C-842, Patterson Constr. Co., Contractor


	CN-12-201-256NA Klamath Project - Oregon-California. View of laser control panel. Red, yellow and green lights indicate if the trencher is on grade. Facing the camera is A. H. Patterson, the contractor; ...
	Citation Citation Citation Abstract Copy Title: Closed Drain Construction - Tule Lake Sump 3 – Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1972, 2009, 2007 CN-12-201-256NA Klamath Project - Oregon-California. View of laser control panel. Red, yellow and green lights indicate if the trencher is on grade. Facing the camera is A. H. Patterson, the contractor; November 1972; Bureau of Reclamation photo by D. W. Stein Title: Closed Drain Construction - Tule Lake Sump 3 – Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1972, 2009, 2007 CN-12-201-256NA Klamath Project - Oregon-California. View of laser control panel. Red, yellow and green lights indicate if the trencher is on grade. Facing the camera is A. H. Patterson, the contractor; November 1972; Bureau of Reclamation photo by D. W. Stein

3. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor


	CN-12-201-254NA Klamath Project - Oregon-California. View of receiver unit mounted on top of the trencher. The location of the laser beam is sensed by this unit. This information is passed to an analog ...
	Citation Citation Citation Abstract Copy Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1973, 2009, 2007 CN-12-201-254NA Klamath Project - Oregon-California. View of receiver unit mounted on top of the trencher. The location of the laser beam is sensed by this unit. This information is passed to an analog computer which operates the hydraulic controls on the trencher. Thus, the receiver unit automatically maintains the digging unit at the desired grade; February 1973; Bureau of Reclamation photo by D. W. Stein Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1973, 2009, 2007 CN-12-201-254NA Klamath Project - Oregon-California. View of receiver unit mounted on top of the trencher. The location of the laser beam is sensed by this unit. This information is passed to an analog computer which operates the hydraulic controls on the trencher. Thus, the receiver unit automatically maintains the digging unit at the desired grade; February 1973; Bureau of Reclamation photo by D. W. Stein

4. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor


	CN-12-201-257NA Klamath Project - Oregon-California. View of the Laser Beam control panel; November 1972; Bureau of Reclamation photo by D. W. Stein
	Citation Citation Citation Abstract Copy Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1972, 2009, 2007 CN-12-201-257NA Klamath Project - Oregon-California. View of the Laser Beam control panel; November 1972; Bureau of Reclamation photo by D. W. Stein Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1972, 2009, 2007 CN-12-201-257NA Klamath Project - Oregon-California. View of the Laser Beam control panel; November 1972; Bureau of Reclamation photo by D. W. Stein