# Relationship history for MSHA mine 1503057

Current hierarchy: **Collins Lonnie → Collins Coal Company → No 17 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 & Mullins Coal Company Inc → No 17 Mine; 1950-01-01 to 1972-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Fonzo → No 17 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Fonzo → Mullins & Mullins Coal Company Inc; 1950-01-01 to 1972-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Collins Coal Company → No 17 Mine; 1972-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collins Lonnie → No 17 Mine; 1972-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Lonnie → Collins Coal Company; 1972-12-02 to current/open; source msha-controller-operator-history