# Relationship history for MSHA mine 3101918

Current hierarchy: **Lynwood Wayne  Pierce → Riverside Sand Company Inc → RIVERSIDE SAND PIT**

- 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:** Riverside Sand Company Inc → RIVERSIDE SAND PIT; 1980-05-01 to 1987-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Brinkley → RIVERSIDE SAND PIT; 1980-05-01 to 1987-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Brinkley → Riverside Sand Company Inc; 1980-05-01 to 1987-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Riverside Sand Company Inc → RIVERSIDE SAND PIT; 1987-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lynwood Wayne  Pierce et al → RIVERSIDE SAND PIT; 1987-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynwood Wayne  Pierce et al → Riverside Sand Company Inc; 1987-08-03 to current/open; source msha-controller-operator-history