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track | |||
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modulated groove | |||
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groove |
纹道: 52 phrases in 14 subjects |
Agriculture | 1 |
Automobiles | 2 |
Aviation | 1 |
Desert science | 2 |
Electric machinery | 1 |
Electronics | 7 |
Metallurgy | 2 |
Oil / petroleum | 2 |
Rail transport | 1 |
Space | 1 |
Technology | 27 |
Telecommunications | 2 |
Textile industry | 2 |
Transport | 1 |