# Relationship history for MSHA mine 1201883

Current hierarchy: **Don  Foertsch → Buckhorn Processing Inc → Buckhorn Processing Inc**

- 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:** C S P Corp → Buckhorn Processing Inc; 1982-03-01 to 1984-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Mulzer Arnold Jr--James Et Al → Buckhorn Processing Inc; 1982-03-01 to 1984-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Mulzer Arnold Jr--James Et Al → C S P Corp; 1982-03-01 to 1984-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Buckhorn Processing Inc → Buckhorn Processing Inc; 1984-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don  Foertsch et al → Buckhorn Processing Inc; 1984-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Foertsch et al → Buckhorn Processing Inc; 1984-11-13 to current/open; source msha-controller-operator-history