# Relationship history for MSHA mine 3503253

Current hierarchy: **Logsdon Norris → Snipe Mountain Sand → SNIPE MTN. SAND**

- 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:** Snipes Mountain Sand Inc → SNIPE MTN. SAND; 1986-04-01 to 1992-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Woodworth Laurie & Kevin → SNIPE MTN. SAND; 1986-04-01 to 1992-08-18; source msha-controller-operator-history
- **controller_controls_operator:** Woodworth Laurie & Kevin → Snipes Mountain Sand Inc; 1986-04-01 to 1992-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Snipe Mountain Sand → SNIPE MTN. SAND; 1992-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Logsdon Norris → SNIPE MTN. SAND; 1992-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Logsdon Norris → Snipe Mountain Sand; 1992-08-19 to current/open; source msha-controller-operator-history