Does using "Tongguan Roujiamo" as a restaurant sign constitute infringement?

No.

On the afternoon of November 26, the Tongguan Roujiamo Association publicly released a "Letter of Apology to Tongguan Roujiamo Operators across the Country." The letter read: "Previously, our Tongguan Roujiamo Association The matter of safeguarding the rights of the Tongguan Roujiamo trademark has brought serious troubles and troubles to the majority of Roujiamo operators. After criticism, correction and help from many media friends, experts and scholars across the country, we have realized our own mistakes. We feel deeply guilty for having discarded the association’s purpose of ‘keeping true to our original aspirations and serving Tongguan Roujiamo operators wholeheartedly’, and hereby sincerely apologize to everyone!”

November 21st! Initially, snack bars with the words "Tongguan Roujiamo" in Henan, Guangdong and other cities were accused of trademark infringement. The merchants said that it was an organization in Shaanxi called "Tongguan Roujiamo Association" that approached them to defend their rights, demanding compensation from them.