| P | Engines, oil fuel |
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| P | Engines, alcohol fuel |
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| P | Engines, natural gas |
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| P | Engines, biogas |
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| P | Engines, gas, liquid petroleum gas (LPG) |
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| P | Engines, producer gas |
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| P | Engines, petrol-paraffin |
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| P | Engines, kerosene |
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| P | Engines, diesel-gas, combined |
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| P | Engines, semi-diesel |
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| P | Engines, turbocharged and supercharged |
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| P | Engines, petrol, stationary, 1 to 8 HP |
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| P | Engines, petrol, stationary, 8 to 25 HP |
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| P | Engines, petrol, stationary, 25 to 50 HP |
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| P | Engines, petrol, stationary, over 50 HP |
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| P | Engines, diesel, stationary, 4 to 25 HP |
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| P | Engines, diesel, stationary, 25 to 100 HP |
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| P | Engines, diesel, stationary, 100 to 450 HP |
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| P | Engines, diesel, stationary, 450 to 1200 HP |
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| P | Engines, diesel, stationary, over 1200 HP |
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| P | Engines, petrol, traction, under 100 HP |
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| P | Engines, petrol, traction, over 100 HP |
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| P | Engines, diesel, traction, 1 to 8 HP |
|---|
| P | Engines, diesel, traction, 8 to 25 HP |
|---|
| P | Engines, diesel, traction, 25 to 100 HP |
|---|
| P | Engines, diesel, traction, 100 to 200 HP |
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| P | Engines, diesel, traction, 200 to 300 HP |
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| P | Engines, diesel, traction, over 300 HP |
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| P | Engines, diesel, portable and semi-portable |
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| P | Engines, diesel, safety and flameproof |
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| P | Engines, marine, inboard, petrol |
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| P | Engines, marine, inboard, diesel |
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| P | Engines, marine, outboard, under 5 HP |
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| P | Engines, marine, outboard, from 5 to 10 HP |
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| P | Engines, marine, outboard, from 10 to 20 HP |
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| P | Engines, marine, outboard, over 20 HP |
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| P | Internal combustion engines for motor cars, trucks/lorries and buses |
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| P | Internal combustion engines for motorcycles and scooters |
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| P | Internal combustion engines for military vehicles |
|---|
| P | Internal combustion engines for agricultural machinery |
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| P | Internal combustion engines for earth-moving machinery |
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| P | Internal combustion engines for locomotives |
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| P | Diesel engines for submarines |
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| P | Engines, gas, stationary |
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| P | Engines, gas, safety and explosion proof |
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| P | Internal combustion engines for bicycles |
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