# Relationship history for MSHA mine 0102139

Current hierarchy: **Hughes Jimmy → D & J Sand & Gravel Inc → D & J Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Flatwood Sand & Gravel Inc → D & J Sand & Gravel; 1979-01-01 to 1982-11-28; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Jimmy → D & J Sand & Gravel; 1979-01-01 to 1982-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Jimmy → Flatwood Sand & Gravel Inc; 1979-01-01 to 1982-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Flatwood Sand & Gravel Inc → D & J Sand & Gravel; 1982-11-29 to 1986-09-29; source msha-controller-operator-history
- **controller_controls_mine:** Bracknell Earl → D & J Sand & Gravel; 1982-11-29 to 1986-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Bracknell Earl → Flatwood Sand & Gravel Inc; 1982-11-29 to 1986-09-29; source msha-controller-operator-history
- **operator_operates_mine:** D & J Sand & Gravel Inc → D & J Sand & Gravel; 1986-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Jimmy → D & J Sand & Gravel; 1986-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Jimmy → D & J Sand & Gravel Inc; 1986-09-30 to current/open; source msha-controller-operator-history