# Relationship history for MSHA mine 0901050

Current hierarchy: **Imerys S A → Georgia Marble Company → Kennesaw Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Imerys S A → Kennesaw Mine; 1989-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Marble Company → Kennesaw Mine; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Georgia Marble Company; 1990-05-01 to current/open; source msha-controller-operator-history