【电学】干片整流器【运输】干式金属盘整流器

dry-plate rectifier from selenium, tellurium, pressing on the layer

dry-plate rectifier from selenium, tellurium, surface treatment of the layer

dry-plate rectifier from selenium, tellurium, vapour deposition of the layer

selenium layer dry-plate rectifier

melting on dry-plate rectifier from selenium, tellurium, melting on the layer

dry-plate rectifier selenium, tellurium

dry-plate rectifier from selenium, tellurium

of dry-plate rectifier from selenium, tellurium