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有效期是三年，我和儿子的H4上周也收到approved notice 了。我老公要换去新公司，就要H1b transfer , 看了您的答复，我的理解是我老公只要新公司给他申请了H1b transfer， 在pending期间就可以去新公司上班了，对吗?

-Yes. He can work for the new company after getting the H-1 transfer receipt notice.