(a) The immediate vendor of any lot of seed which is sold, offered or exposed for sale shall be responsible for the presence of the labels required to be attached to any lots of seed whether he is offering for sale or selling seed which bears labels of a previous vendor, with or without endorsement, or bears his own label.
(b) The labeler of any original or unbroken lot of seed shall be responsible for the presence of and the information on all labels attached to said lot of seed at the time he sells or offers for sale such lot of seed.