# Relationship history for MSHA mine 1506330

Current hierarchy: **Surgener Lonnie → Lon-Ray Corp → 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:** Bailey Coal Company → No 1 Mine; 1950-01-01 to 1974-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Coal Company → No 1 Mine; 1950-01-01 to 1974-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Coal Company → Bailey Coal Company; 1950-01-01 to 1974-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Surgener Coal Sales Inc → No 1 Mine; 1974-03-02 to 1975-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Surgener Noah → No 1 Mine; 1974-03-02 to 1975-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Surgener Noah → Surgener Coal Sales Inc; 1974-03-02 to 1975-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Lon-Ray Corp → No 1 Mine; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Surgener Lonnie → No 1 Mine; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Surgener Lonnie → Lon-Ray Corp; 1975-05-01 to current/open; source msha-controller-operator-history