# Relationship history for MSHA mine 1518351

Current hierarchy: **John C  Haydon → Haydon Brothers Aggregate LLC → PLEASANT RUN STONE**

- 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

- **operator_operates_mine:** Haydon Brothers Aggregate LLC → PLEASANT RUN STONE; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John C  Haydon et al → PLEASANT RUN STONE; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Haydon et al → Haydon Brothers Aggregate LLC; 2001-03-01 to current/open; source msha-controller-operator-history