What specific U.S. patent did Gideon Sundback secure on April 29, 1913?

Answer

Hookless Fastener No. 1

Gideon Sundback secured a key U.S. patent on April 29, 1913, for his perfected design, which he termed the 'Hookless Fastener No. 1'.

What specific U.S. patent did Gideon Sundback secure on April 29, 1913?
nameinventionfastenerzipper