# Relationship history for MSHA mine 0900020

Current hierarchy: **F L (Rusty)  Adams → Star Granite Co. → Highpoint Quarry**

- 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

- **controller_controls_mine:** F L (Rusty)  Adams → Highpoint Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elberton Granite Industries → Highpoint Quarry; 1950-01-01 to 2014-04-15; source msha-controller-operator-history
- **controller_controls_mine:** John D  Mc Lanahan  et al → Highpoint Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Mc Lanahan  et al → Elberton Granite Industries; 1950-01-01 to 2014-04-15; source msha-controller-operator-history
- **controller_controls_operator:** John D  Mc Lanahan Jr  et al → Elberton Granite Industries; 1950-01-01 to 2014-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Star Granite Co. → Highpoint Quarry; 2014-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** F L (Rusty)  Adams → Star Granite Co.; 2014-04-16 to current/open; source msha-controller-operator-history