Built-in single-key telephone set

Application Number: 00119180Application Date: 2000.07.03Publication Number: 1331537Publication Date: 2002.01.16Priority Information: International: H04M1/02Applicant(s) Name: Wu XiuliAddress: Inventor(s) Name: Wu XiuliPatent Agency Code: 00000Patent Agent: Abstract A built-in single-key telephone suitable for the cage of elevator, etc. features that pressing an only key on the panel of the said telephone can select internal interphone or external telephone Read more