Yes, if the knowledge is genuinely specific to the company's process and he has a continuous year of qualifying employment abroad. L-1B has no degree requirement; it has a knowledge requirement.
The controller program is the evidence, not the trade licence
Specialized knowledge means special knowledge of the company's product, service, research, equipment, techniques or management and its application in international markets, or an advanced level of knowledge of the company's processes and procedures. A trade licence proves general competence and nothing more. The petition must instead show that the mixing-line logic, interlocks and recipes are the company's own development, that the electrician designed or substantially modified them, and that the U.S.
plant needs that knowledge to replicate the line. Evidence such as the change log, internal design documents, training he delivered to colleagues and a supervisor's explanation of why the logic differs from off-the-shelf configurations does that work. The knowledge does not have to be proprietary in a patent sense, but it must be more than familiarity with common controller platforms.
The year abroad, the corporate relationship and the doing-business status of both entities remain separate requirements.