# Relationship history for MSHA mine 1510173

Current hierarchy: **Collins Lonnie R → Bent Mountain Coal Company Inc → No 9 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

- **controller_controls_mine:** Collins Lonnie R → No 9 Mine; 1976-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emmett  Lawson → No 9 Mine; 1976-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lawson Coal Company Inc → No 9 Mine; 1977-01-01 to 1979-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Emmett  Lawson → Lawson Coal Company Inc; 1977-01-01 to 1979-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Bent Mountain Coal Company Inc → No 9 Mine; 1979-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Lonnie R → Bent Mountain Coal Company Inc; 1979-08-08 to current/open; source msha-controller-operator-history