which one arrived first?

 Sun Ra did not use the term "birthday" - he referred to "arrival day"... 

so which of the following "arrived" first?

the Western Electric 555...

or Marshall Allen?

the answer below the scroll..

Marshall Allen arrived first! ... in 1924... 

the first 555 drivers were made in the BTL lab in 1926....

fwiw, the two go well together... 

(and see, Iain, I can post!)

peace,

me

(the other one)