Validity of B1 post issuance and cancellation of H1

fish4all

Registered Users (C)
I was issued a B1 visa in 2006 (valid until 2016) on which I travelled to US in 2006 and obtained H1 (before expiry of maximum stay i.e. 6 months) and worked in US for almost 1.2 years. Travelled back to my home country in 2007 but did not get H1 stamping since I decided not to go back. My employer had cancelled my H1.

My passport still has the same B1 visa valid until 2016. Can I travel to US on the same visa or do I need to get a fresh visa assuming B1 was cancelled when changed to H1.
 
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