# Relationship history for MSHA mine 0301979

Current hierarchy: **Ted  Smith; Tom  Reed → SEMCOA → Section 27**

- 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:** SEMCOA → Section 27; 2008-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Smith et al → Section 27; 2008-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Smith et al → SEMCOA; 2008-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Reed et al → SEMCOA; 2008-12-04 to current/open; source msha-controller-operator-history