# Relationship history for MSHA mine 4401752

Current hierarchy: **David M  Maynard → Mabo Coal Company Inc → 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:** Dotson Coal Company Inc → No 1 Mine; 1950-01-01 to 1977-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Dotson Lonnie → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dotson Lonnie → Dotson Coal Company Inc; 1950-01-01 to 1977-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Mabo Coal Company Inc → No 1 Mine; 1977-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M  Maynard → No 1 Mine; 1977-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Maynard → Mabo Coal Company Inc; 1977-05-05 to current/open; source msha-controller-operator-history