| 摘要 |
The invention relates to a device for observing the interior of a body, especially of a stone, by means of a bore sunk into the body, a tube (3, 3a) made of elastic, transparent plastic, whose external diameter corresponds approximately to that of the bore (1), and of a stretching device (4, 4a) by which the tube can be pressed against the cylindrical bore wall around its entire circumference. <IMAGE>
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