# Relationship history for MSHA mine 4103252

Current hierarchy: **Tierce Carol & Erma Stillwell → Suntide Sand Pit Inc → Suntide Sand Pit Incorporated**

- 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:** Coastal Sand & Gravel Inc → Suntide Sand Pit Incorporated; 1984-08-01 to 1988-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Cisneros Amado Martinez → Suntide Sand Pit Incorporated; 1984-08-01 to 1988-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Cisneros Amado Martinez → Coastal Sand & Gravel Inc; 1984-08-01 to 1988-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Mrdco Inc → Suntide Sand Pit Incorporated; 1988-11-17 to 1989-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Reddick Randall B → Suntide Sand Pit Incorporated; 1988-11-17 to 1989-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Reddick Randall B → Mrdco Inc; 1988-11-17 to 1989-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Suntide Sand Pit Inc → Suntide Sand Pit Incorporated; 1989-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tierce Carol & Erma Stillwell → Suntide Sand Pit Incorporated; 1989-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tierce Carol & Erma Stillwell → Suntide Sand Pit Inc; 1989-03-10 to current/open; source msha-controller-operator-history