# Relationship history for MSHA mine 2600405

Current hierarchy: **Baker Hughes Inc → Milchem Inc → Miller 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:** Baker Hughes Inc → Miller Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R W Johnson Mining & Hauling → Miller Mine; 1950-01-01 to 1979-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Johnson R W → Miller Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson R W → R W Johnson Mining & Hauling; 1950-01-01 to 1979-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Milchem Inc → Miller Mine; 1979-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baker Hughes Inc → Milchem Inc; 1979-05-23 to current/open; source msha-controller-operator-history