# Relationship history for MSHA mine 3603192

Current hierarchy: **Ronald G  Coleman; Chris  Coleman → HUNLOCK SAND & GRAVEL COMPANY → HUNLOCK SAND & GRAVEL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Hunlock Sand & Gravel Company → HUNLOCK SAND & GRAVEL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Judith  Rampp → HUNLOCK SAND & GRAVEL; 1950-01-01 to 2013-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Judith  Rampp → Hunlock Sand & Gravel Company; 1950-01-01 to 2013-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Coleman et al → HUNLOCK SAND & GRAVEL; 2013-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Coleman et al → Hunlock Sand & Gravel Company; 2013-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald G  Coleman et al → Hunlock Sand & Gravel Company; 2013-02-28 to current/open; source msha-controller-operator-history