# Relationship history for MSHA mine 3304454

Current hierarchy: **Dale R  Bartley; Mitchell W  Bolin → Bartley & Bolin Inc → BARTLEY & BOLIN INC. PLANT #2**

- 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:** Bartley & Bolin Inc → BARTLEY & BOLIN INC. PLANT #2; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mitchell W  Bolin  et al → BARTLEY & BOLIN INC. PLANT #2; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell W  Bolin  et al → Bartley & Bolin Inc; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale R  Bartley  et al → Bartley & Bolin Inc; 2000-04-01 to current/open; source msha-controller-operator-history