# Relationship history for MSHA mine 1506855

Current hierarchy: **Looney Coal Company → Looney Coal Co → No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mullins Coal Company → No 1 Mine; 1950-01-01 to 1975-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Jack → No 1 Mine; 1950-01-01 to 1975-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Jack → Mullins Coal Company; 1950-01-01 to 1975-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Looney Coal Co → No 1 Mine; 1975-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Looney Coal Company → No 1 Mine; 1975-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Looney Coal Company → Looney Coal Co; 1975-04-29 to current/open; source msha-controller-operator-history