This register serves as a comprehensive directory for manufacturers within California for the year 1990. It compiles essential business information, providing a snapshot of the state's industrial landscape at that time. The primary argument is the utility of such a directory for businesses seeking to identify and connect with manufacturing entities across various sectors in California.

As a historical business directory, its value lies in its archival nature. Such registers are typically consulted by researchers, business historians, or individuals seeking specific historical business data. Its reception is therefore functional, based on the accuracy and completeness of the information it contained for its intended period of use.