# Relationship history for MSHA mine 0600564

Current hierarchy: **Ralph A  Forgione; David A  Forgione → The F & F Concrete Corporation → F & F Sand & Gravel Plant**

- 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:** The F & F Concrete Corporation → F & F Sand & Gravel Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David A  Forgione  et al → F & F Sand & Gravel Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Forgione  et al → The F & F Concrete Corporation; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph A  Forgione  et al → The F & F Concrete Corporation; 1950-01-01 to current/open; source msha-controller-operator-history