[Mick]

One pitcher had 20 years pitching at least 200 innings. Who ?
Two more with 19 years. Who?
And several with 16 years. Three were Giants who were the Giants ?

Cy Young on the 20 and 200. Nolan Ryan on the 19. 

Warren Spahn, Grover Cleveland Alexander. Phil Niekro.

I think the three Giants were Mathewson, McGinnity, Marichal with 16 years. If not McGinnity, I'd say Hubbell.  Probably not Marquard, Rusie or any of the modern day Giants. Perry wasn't around long enough. He's probably on the list, but didn't do all seasons with the Giants.

[Mick]

One pitcher had 20 years pitching at least 200 innings. Who ?
Two more with 19 years. Who?
And several with 16 years. Three were Giants who were the Giants ?

Cy Young on the 20 and 200. Nolan Ryan on the 19. 

Warren Spahn, Grover Cleveland Alexander. Phil Niekro.

I think the three Giants were Mathewson, McGinnity, Marichal with 16 years. If not McGinnity, I'd say Hubbell.  Probably not Marquard, Rusie or any of the modern day Giants. Perry wasn't around long enough. He's probably on the list, but didn't do all seasons with the Giants.