# Relationship history for MSHA mine 4606629

Current hierarchy: **Chris  Cline → Spencer Resources Inc → #1 Refuse Pile**

- 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:** Reserve Development Corp → #1 Refuse Pile; 1983-02-01 to 1986-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Henderson Archie Bob → #1 Refuse Pile; 1983-02-01 to 1987-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Henderson Archie Bob → Reserve Development Corp; 1983-02-01 to 1986-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Coal Services → #1 Refuse Pile; 1986-09-11 to 1986-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Hilden J G → #1 Refuse Pile; 1986-09-11 to 1986-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Hilden J G → Appalachian Coal Services; 1986-09-11 to 1986-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Reserve Development Corp → #1 Refuse Pile; 1986-11-25 to 1987-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Henderson Archie Bob → Reserve Development Corp; 1986-11-25 to 1987-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Spencer Resources Inc → #1 Refuse Pile; 1987-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Cline → #1 Refuse Pile; 1987-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Cline → Spencer Resources Inc; 1987-12-14 to current/open; source msha-controller-operator-history