# Relationship history for MSHA mine 3607400

Current hierarchy: **Bauman Daniel → Armstrong Coal & Coke Company → Armstrong Coal & Coke Co**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Armstrong Coal & Coke Company → Armstrong Coal & Coke Co; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bauman Daniel → Armstrong Coal & Coke Co; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bauman Daniel → Armstrong Coal & Coke Company; 1982-11-01 to current/open; source msha-controller-operator-history