Transfer function from Bode-plot

Could anyone lead me through the steps of getting the transfer function from this Bode-diagram?

http://i.imgur.com/1kWvheO.png

I've been reading up on this material but can't quite get a hang of the method I need to reverse-engineer this plot.

What I know is that the break frequencies are at w=10, w=100, w=1000.

The slope for $\omega\leq 10$ is 20dB/dec (simple zero?)

The slope from $10\leq\omega\leq 100$ is -20 dB/dec (is that a quadratic pole? since 20-40 = -20)

The slope from $100\leq\omega\leq 1000$ is 0 dB/dec (simple zero?)

The slope for $\omega\geq 1000$ is -40dB/dec (quadratic pole?)

-