# Relationship history for MSHA mine 4003014

Current hierarchy: **John  Pritchard → Fortis Sand & Gravel LLC → Childers Hill**

- 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:** Pickwick Construction Company → Childers Hill; 1989-05-01 to 2001-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Charles E Irons → Childers Hill; 1989-05-01 to 2001-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Charles E Irons → Pickwick Construction Company; 1989-05-01 to 2001-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Trico Construction Materials, Inc → Childers Hill; 2001-04-30 to 2025-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Gene  Blanton et al → Childers Hill; 2001-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene  Blanton et al → Trico Construction Materials, Inc; 2001-04-30 to 2025-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Fortis Sand & Gravel LLC → Childers Hill; 2025-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Pritchard → Childers Hill; 2025-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Pritchard → Fortis Sand & Gravel LLC; 2025-02-03 to current/open; source msha-controller-operator-history