Dit-dit-dit in the sand

“I took a beach chair down to the beach and sat down. And I’m thinking, How the hell am I going to pull this off? I was just thinking to myself, What do I need? Well, the first thing I need is some sort of code. And the only code I knew of was Morse code. You know, I had to learn that in the Boy Scouts when I was a youngster. And I was thinking, [singing] ‘dit-dit-dit, daaah-daaah-daaah, dit-dit-dit’. Remember what that is? That’s SOS. Dit-dit-dit was S. I stuck my four fingers down into the sand and for whatever reason I pulled them to myself.”

This is a chap named Joe Woodland speaking. What did he go on to invent?

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Question by Amit Varma