# Relationship history for MSHA mine 3101476

Current hierarchy: **Barbara  Riddle; Jess  Cooper → Yancey Sand & Gravel Company → Pensacola Pit & Plant**

- 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:** Yancey Sand & Gravel Company → Pensacola Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jess  Cooper et al → Pensacola Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jess  Cooper et al → Yancey Sand & Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Riddle et al → Yancey Sand & Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history