To prevent recorded speech information from being erased erroneously without marring the external appearance of a return postcard by a method wherein the speech information is so constituted as to recordable in the return postcard in a speech information sending body formed by connecting a letter sent to get a reply part with a reply letter part.
In a double postal card 1 formed by connecting a postcard for a letter sent to get a reply 2 with the return postcard 3, a speech information recording/reproducing part 30, which is inserted between two surface sheets 10a and 10b and can record and reproduce speech information is inserted between the two surface sheets 10a and 10b under the condition that a connector substrate 50, on which a wiring pattern 37e for recording speech information is formed, stretches over both the postcard for a letter sent to get a reply 2 and the return postcard 3.
HANAZAWA FUMIHIRO
| JPS6433694A | 1989-02-03 |
Katsuhiro Ito
Ishibashi Masayuki