# Relationship history for MSHA mine 1701167

Current hierarchy: **Adam C  Gammon; Stacy A  Gammon → A & B Crushing and Screening → CEC JAW**

- 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

- **controller_controls_mine:** Stacy A  Gammon et al → CEC JAW; 2016-09-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & B Crushing and Screening → CEC JAW; 2025-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy A  Gammon et al → A & B Crushing and Screening; 2025-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam C  Gammon et al → A & B Crushing and Screening; 2025-08-14 to current/open; source msha-controller-operator-history