# Relationship history for MSHA mine 0800700

Current hierarchy: **Brevard County-Fl → Brevard Cnty Board Of Comm-Road & Bridge Dept → Rockledge Rock Mine**

- 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:** Palmetto Rock Company Inc → Rockledge Rock Mine; 1950-01-01 to 1979-01-09; source msha-controller-operator-history
- **controller_controls_mine:** George S Pappas → Rockledge Rock Mine; 1950-01-01 to 1980-07-28; source msha-controller-operator-history
- **controller_controls_operator:** George S Pappas → Palmetto Rock Company Inc; 1950-01-01 to 1979-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Brevard Cnty Board Of Comm-Road & Bridge Dept → Rockledge Rock Mine; 1979-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brevard County-Fl → Rockledge Rock Mine; 1979-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brevard County-Fl → Brevard Cnty Board Of Comm-Road & Bridge Dept; 1979-01-10 to current/open; source msha-controller-operator-history