What specialized machine did Gideon Sundback invent to facilitate the mass production of his complex interlocking elements?

Answer

S-L machine

Sundback designed the specialized 'S-L machine' to produce his complex interlocking elements quickly and efficiently, capable of manufacturing hundreds of feet of fastener chain daily.

What specialized machine did Gideon Sundback invent to facilitate the mass production of his complex interlocking elements?
nameinventionfastenerzipper