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| firing box | |||
| blasting machine; exploder; break-flash apparatus; spark test apparatus | |||
| spark gap | |||
| protective spark gap | |||
| spark-gap | |||
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explosor : 17 phrases in 7 subjects |
| Antennas and waveguides | 1 |
| Automated equipment | 1 |
| Communications | 4 |
| Electronics | 7 |
| General | 1 |
| Measuring instruments | 2 |
| Technology | 1 |