# Relationship history for MSHA mine 1516265

Current hierarchy: **Lanham Roy → H I C O Coal Company → Z**

- 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:** Lanham Roy Et Al → Z; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H I C O Coal Company → Z; 1987-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lanham Roy Et Al → H I C O Coal Company; 1987-12-01 to current/open; source msha-controller-operator-history