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| 082 |
_a338.47671522(54) _bN277.AD |
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| 100 | _aN. C. A. E. R., New Delhi | ||
| 245 |
_aAppraisal of demand for oxygen dissolved acetylene welding electrodes gas cylinders _b |
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| 260 |
_aNew Delhi _bNCAER _c1961 |
||
| 300 | _a115P. | ||
| 500 | _a | ||
| 690 | _a | ||
| 700 | _a | ||
| 964 |
_a _b _c _d _e _f _g |
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| 921 | _a5420 | ||
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_c5420 _d5420 |
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