Category:自働式電話交換
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| This is the category for the Japanese book 自働式電話交換. |
日本語: 自働式電話交換
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Media in category "自働式電話交換"
The following 2 files are in this category, out of 2 total.
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NDL1017829 自働式電話交換 part1.pdf 6,322 × 4,135, 100 pages; 51.79 MB
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NDL1017829 自働式電話交換 part2.pdf 6,322 × 4,135, 46 pages; 24.89 MB