# Relationship history for MSHA mine 1503019

Current hierarchy: **Akers Kenneth → Julie Coal Co → No C-71 Mine**

- 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:** Ligon Preparation Company → No C-71 Mine; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Holbrook Mary Jane → No C-71 Mine; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Holbrook Mary Jane → Ligon Preparation Company; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Julie Coal Co → No C-71 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Akers Kenneth → No C-71 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Akers Kenneth → Julie Coal Co; 1974-01-01 to current/open; source msha-controller-operator-history