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| 1890-19?? | 19??-1969 | 1968-1991 | 1975 (unused) | 1991–present | 2000–present |
1890-19??[]
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LOGO MISSING |
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UNKNOWN YEAR |
19??-1969[]
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BETTER LOGO NEEDED |
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UNKNOWN YEAR |
1968–1991[]
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SVG NEEDED |
1975 (unused)[]
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A new identity was in the process of being completed in 1975, until all work was terminated due to the ongoing oil crisis.
1991–present[]
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Logo used on machinery
2000–present[]
