# Aftertreatment

Part ID: 7.13b · Layer 7 (Electrical: power distribution (grid to rack)) · child of 7.13

Emissions-control equipment fitted to backup generator engines to meet air-quality permitting requirements where they run.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| Johnson Matthey | manufacturer | inferred | public | JMAT.L |  |
| Miratech | manufacturer | inferred | private |  |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.