It looks like the balloon depicted in the stereo card belong to the Temporary Balloon Corps /
臨時気球隊/ that was established on June 7, 1904 under the command of Major Kōno Nagatoshi /
河野長敏工兵少佐/ and participated in the Port Arthur siege from the beginning of August. Originally equipped with two balloones manufactured by Yamada Balloon Manufacturing Co., Ltd. /
山田気球製作所/ it is believed that later it was also equipped with balloons made by Shibaura Seisakusho. Shibaura Seisakusho /
芝浦製作所 - Shibaura Engineering Works/ was the new name given to the company Tanaka Seisakusho (Tanaka Engineering Works), after it was declared insolvent in 1893 and taken over by Mitsui Bank. In 1910, it formed a tie-up with GE USA, which, in exchange for technology acquired about a quarter of the shares of Shibaura. With this investment GE now had a stake in both Tokyo Denki and Shibaura Seisakusho - two companies that had a complementary line of products in light as well as heavy electrical equipment. Both companies were merged in 1939 to create Tokyo Shibaura Denki (Tokyo Shibaura Electric Company, now known as Toshiba).
Following the success of the Temporary Balloon Corps, in 1905 a Balloon Team /
気球班/ was set up in the Telegraph Training School in Nakano, Tokyo. In October 1907 the Balloon Team was reorganized into the Army Balloon Corps /
陸軍気球隊/ which became part of the Transportation Corps Brigade (combined the Railroad Corps, Telegraph Battalion, and Balloon Corps). It was headed by Major Kōno Nagatoshi and consisted of 145 members and 9 horses. On October 20, 1913 the Army Balloon Corps was transferred to Tokorozawa Airfield.