Räknesticka, tillverkare Hemmi, Japan

Räknesticka Hemmi okänd ålder (modell 130 System Darmstadt, tillverkad 1951-1968), lite ovanlig i bambu, med etui. 'Hemmi Bamboo Slide Rule Company Ltd. in Japan is the oldest and most well known Japanese manufacturing company making slide rules. Jirou Hemmi and Company was founded in 1895 and, in 1912, was granted by the Japanese Patent Office Patent No. 22129 for their laminated bamboo construction method for slide rules'.