# Relationship history for MSHA mine 1516022

Current hierarchy: **Fannin Larry & Robert → J & L Sand & Gravel Company → J & L Sand & Gravel Company**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Hinkle Sand & Gravel Company → J & L Sand & Gravel Company; 1987-05-01 to 1988-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Hinkle Kenneth & Everett Horn → J & L Sand & Gravel Company; 1987-05-01 to 1988-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Hinkle Kenneth & Everett Horn → Hinkle Sand & Gravel Company; 1987-05-01 to 1988-03-14; source msha-controller-operator-history
- **operator_operates_mine:** J & L Sand & Gravel Company → J & L Sand & Gravel Company; 1988-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fannin Larry & Robert → J & L Sand & Gravel Company; 1988-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fannin Larry & Robert → J & L Sand & Gravel Company; 1988-03-15 to current/open; source msha-controller-operator-history