| 摘要 |
PROBLEM TO BE SOLVED: To perform reflection-type X-ray photographing. SOLUTION: This electromagnetic wave constant progressing direction selector is made by stretching a plurality of wire net-shaped objects 1 in layers on an inner frame 2 so that their meshes accurately coincide with each other, making an outer frame 3 out of lead plates, placing a film 4 thereon, and putting a lid 5 made of a lead plate thereon.
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