obse - opti
- observation
- observation accuracy
- observation against a bright background
- observation against a bright field
- observation against a dark background
- observation against a dark field
- observation by incident light
- observation by transmitted light
- observation port
- observed result
- occurrence
- ocean cable
- OEM
- off-gas
- off-line control
- off-line mode
- off-line operation
- off-position
- off-the-shelf component
- office
- office cable
- office telephone number
- offset
- offset beam
- offset current
- ohm
- ohmic resistance
- oil
- oil based enamel
- oil based enamel varnish
- oil cooling
- oil emulsion
- oil insulation
- oil well
- oil-and-petrol resistance
- oil-cooled cable
- oil-duct
- oil-filled cable
- oil-filled high pressure cable
- oil-filled low pressure cable
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