| 摘要 |
Method for producing miniature lamps comprising the steps of heating a stem by radiation such as infrared rays by which inner periphery of a glass tube contacting the stem is melted, said heating is performed in the vacuum atmosphere, and at the same time shielding the other parts of the glass tube that do not contact the stem from the radiation, and cooling said other parts of the glass tube by the radiation between the other parts and a boat made of metals, whereby miniature lamps used in a wrist watch are produced with good efficiency.
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