# Relationship history for MSHA mine 0600225

Current hierarchy: **Robert  Joly Jr; Mark  Seiffert; Derek  Seney → Ernest Joly & Sons Inc → Danielson Pit & Mill**

- 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:** Ernest Joly & Sons Inc → Danielson Pit & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rand  Joly et al → Danielson Pit & Mill; 1950-01-01 to 2021-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Rand  Joly et al → Ernest Joly & Sons Inc; 1950-01-01 to 2021-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Joly Jr et al → Danielson Pit & Mill; 2021-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Joly Jr et al → Ernest Joly & Sons Inc; 2021-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Seiffert et al → Ernest Joly & Sons Inc; 2021-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Seney et al → Ernest Joly & Sons Inc; 2021-01-02 to current/open; source msha-controller-operator-history