Where is the company name written on the calligraphy works?

There are two kinds of signatures: "double" and "single". In the two paragraphs, the object and author of the book are placed above and below respectively, the former is the upper paragraph and the latter is the lower paragraph.

The preceding paragraph shall specify the name, source and recipient's name of the work; The next paragraph describes the date, place and author's name of creation. The preceding paragraph: the position should be higher to show respect, including name, title and courtesy. Next paragraph: Write the time, place, name and polite expressions.