# Relationship history for MSHA mine 4502674

Current hierarchy: **Herriman Coy → Coy & Glenn Herriman → D & R Pit**

- 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:** Coy & Glenn Herriman → D & R Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Herriman Coy → D & R Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herriman Coy → Coy & Glenn Herriman; 1979-01-01 to current/open; source msha-controller-operator-history