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blasting (4) 4
combustion engines (4) 4
heating (4) 4
hot-gas or combustion-product engine plants (4) 4
lighting (4) 4
mechanical engineering (4) 4
weapons (4) 4
basic electric elements (3) 3
electricity (3) 3
climate change mitigation technologies related totransportation (2) 2
general tagging of cross-sectional technologies spanning over several sections of the ipc (2) 2
general tagging of new technological developments (2) 2
ignition, other than compression ignition, forinternal-combustion engines (2) 2
processes or means, e.g. batteries, for the direct conversionof chemical into electrical energy (2) 2
supplying combustion engines in general, with combustiblemixtures or constituents thereof (2) 2
technical subjects covered by former uspc cross-reference art collections [xracs] and digests (2) 2
technologies or applications for mitigation or adaptation againstclimate change (2) 2
testing of ignition timing in compression-ignition engines (2) 2
circuit arrangements or systems for supplying or distributingelectric power (1) 1
controlling combustion engines (1) 1
conversion or distribution of electric power (1) 1
corona devices (1) 1
generating ions to be introduced into non-enclosed gases (1) 1
generation (1) 1
overvoltage arresters using spark gaps (1) 1
spark gaps (1) 1
sparking plugs (1) 1
systems for storing electric energy (1) 1
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