# Relationship history for MSHA mine 3304325

Current hierarchy: **Jeffrey R  Sidwell → Sidwell Materials Inc → SIDWELL QUARRY-PA CRUSHER (PORTA**

- 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

- **controller_controls_mine:** Dale R  Sidwell et al → SIDWELL QUARRY-PA CRUSHER (PORTA; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sidwell Brothers Inc → SIDWELL QUARRY-PA CRUSHER (PORTA; 1994-04-01 to 1998-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Dale R  Sidwell et al → Sidwell Brothers Inc; 1994-04-01 to 1998-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey R  Sidwell → SIDWELL QUARRY-PA CRUSHER (PORTA; 1996-02-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sidwell Materials Inc → SIDWELL QUARRY-PA CRUSHER (PORTA; 1998-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey R  Sidwell → Sidwell Materials Inc; 1998-01-13 to current/open; source msha-controller-operator-history