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13 May 2021
On this date in . . .
from: http://www.scopesys.com
    
1958 – The trademark Velcro is registered.

AND IN MILITARY HISTORY
from: thisdayinusmilhist.wordpress.com

1905 – An Executive Order extended the jurisdiction of the Lighthouse Service to the noncontiguous territory of Guam Island.
1928 – Marines participated in the Battle of Coco River in Nicaragua. A Marine-Guardia patrol under Captain Robert S. Hunter collided with an aggressive band of rebels. Apparently neither side was expecting an encounter. While pushing through a ravine, Captain Hunter’s point met a part of the enemy advance guard. Once this small group had been driven off, the Marines again pushed forward; but the rebels had gained time to deploy along the trail. The enemy opened fire with everything he had. Captain Hunter was seriously wounded, and command devolved upon 2d Lieutenant Earl S. Piper. The attackers pulled back before sunset, which enabled the young lieutenant to establish a perimeter defense. After dawn of 14 May, Lieutenant Piper sent a patrol to reconnoiter the positions which the enemy had abandoned. When it encountered no resistance, he concluded correctly that the rebels had divided their force to block the trail in either direction from his defensive perimeter. Concern for his wounded left him no alternative but to try to break through to the south toward La Flor and Quilali. Piper’s route of withdrawal carried him between two hills, Cinco and Ocho; and here the enemy lay in wait. Forty-five minutes of bitter fighting followed. The patrol reached La Flor coffee plantation on 15 May, and established a strong defensive position. All in all, Piper’s men had come through their ordeal in excellent condition. As soon as reinforcements arrived, they would be able to move northward once more; but help was slow in coming. Not until 22 May did a column commanded by Major K. M. Rockey arrive at the plantation.
1944 – An American escort destroyer sinks the Japanese submarine I-501 (formerly U-1224) off the Azores. The submarine had been presented to the Japanese by the German Kriegsmarine.
1945 – On Okinawa, fierce fighting continues along the Shuri Line. The US 6th Marine Division suffers heavy losses but completes the capture of Dakeshi Ridge. On the east coast, elements of the US 96th Division penetrate the strip east of the Shuri line and take part of Conical Hill.