# Relationship history for MSHA mine 2301906

Current hierarchy: **Bassett Kent → Bassett Sand & Gravel Inc → PLANT #1**

- 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:** Tri-County Sand & Gravel → PLANT #1; 1984-08-01 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Harris Charles → PLANT #1; 1984-08-01 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Harris Charles → Tri-County Sand & Gravel; 1984-08-01 to 1987-01-05; source msha-controller-operator-history
- **operator_operates_mine:** G & D Sand & Gravel → PLANT #1; 1987-01-06 to 1988-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Green Alva & Danny Dye → PLANT #1; 1987-01-06 to 1988-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Green Alva & Danny Dye → G & D Sand & Gravel; 1987-01-06 to 1988-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Dye Sand & Gravel → PLANT #1; 1988-06-23 to 1988-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Dye Dannie → PLANT #1; 1988-06-23 to 1988-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Dye Dannie → Dye Sand & Gravel; 1988-06-23 to 1988-07-17; source msha-controller-operator-history
- **operator_operates_mine:** Green Sand & Gravel → PLANT #1; 1988-07-18 to 1991-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Alva  Green → PLANT #1; 1988-07-18 to 1991-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Alva  Green → Green Sand & Gravel; 1988-07-18 to 1991-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Grale Inc → PLANT #1; 1991-04-16 to 1997-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Hale Jered M → PLANT #1; 1991-04-16 to 1997-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Hale Jered M → Grale Inc; 1991-04-16 to 1997-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Bassett Sand & Gravel Inc → PLANT #1; 1997-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bassett Kent → PLANT #1; 1997-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bassett Kent → Bassett Sand & Gravel Inc; 1997-06-27 to current/open; source msha-controller-operator-history