# Relationship history for MSHA mine 0301150

Current hierarchy: **Garner Frank J → B & G Sand & Gravel Inc → River Port**

- 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:** Paris Materials → River Port; 1950-01-01 to 1979-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Gilbert Blackie → River Port; 1950-01-01 to 1979-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert Blackie → Paris Materials; 1950-01-01 to 1979-08-15; source msha-controller-operator-history
- **operator_operates_mine:** B & G Sand & Gravel Company → River Port; 1979-08-16 to 1982-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Goodwin C L → River Port; 1979-08-16 to 1982-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Goodwin C L → B & G Sand & Gravel Company; 1979-08-16 to 1982-11-01; source msha-controller-operator-history
- **operator_operates_mine:** F G Sand & Gravel → River Port; 1982-11-02 to 1984-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Garner Frank J → River Port; 1982-11-02 to 1984-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Garner Frank J → F G Sand & Gravel; 1982-11-02 to 1984-09-14; source msha-controller-operator-history
- **operator_operates_mine:** S & D Sand & Gravel Inc → River Port; 1984-09-15 to 1987-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Morris L  Denton → River Port; 1984-09-15 to 1987-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Morris L  Denton → S & D Sand & Gravel Inc; 1984-09-15 to 1987-03-24; source msha-controller-operator-history
- **operator_operates_mine:** B & G Sand & Gravel Inc → River Port; 1987-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Garner Frank J → River Port; 1987-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garner Frank J → B & G Sand & Gravel Inc; 1987-03-25 to current/open; source msha-controller-operator-history