# Relationship history for MSHA mine 1507236

Current hierarchy: **Davis Paul E → Chilvalee Coal Company → No 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Financial Coal Company Inc → No 1; 1974-10-01 to 1975-07-15; source msha-controller-operator-history
- **controller_controls_mine:** New Roscoe → No 1; 1974-10-01 to 1975-07-15; source msha-controller-operator-history
- **controller_controls_operator:** New Roscoe → Financial Coal Company Inc; 1974-10-01 to 1975-07-15; source msha-controller-operator-history
- **operator_operates_mine:** North American Mining Corp → No 1; 1975-07-16 to 1976-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Coons Jerry W → No 1; 1975-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coons Jerry W → North American Mining Corp; 1975-07-16 to 1976-05-06; source msha-controller-operator-history
- **operator_operates_mine:** North American Mining Corp → No 1; 1976-05-07 to 1977-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Keller John → No 1; 1976-05-07 to 1977-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Keller John → North American Mining Corp; 1976-05-07 to 1977-05-11; source msha-controller-operator-history
- **operator_operates_mine:** D M Ramey Coal Company → No 1; 1977-05-12 to 1977-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Ramey Dennis M → No 1; 1977-05-12 to 1977-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Ramey Dennis M → D M Ramey Coal Company; 1977-05-12 to 1977-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Partridge Coal Company → No 1; 1977-06-02 to 1980-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Powell Robert D → No 1; 1977-06-02 to 1980-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Powell Robert D → Partridge Coal Company; 1977-06-02 to 1980-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Chilvalee Coal Company → No 1; 1980-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Paul E → No 1; 1980-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Paul E → Chilvalee Coal Company; 1980-06-07 to current/open; source msha-controller-operator-history