# Relationship history for MSHA mine 2500525

Current hierarchy: **Jay  Hancock → Hancock Gravel & Ready Mix → HANCOCK GRAVEL & READY MIX**

- 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:** Francis H Gillen → HANCOCK GRAVEL & READY MIX; 1950-01-01 to 1991-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Francis H  Gillen → HANCOCK GRAVEL & READY MIX; 1950-01-01 to 1991-12-03; source msha-controller-operator-history
- **controller_controls_operator:** Francis H  Gillen → Francis H Gillen; 1950-01-01 to 1991-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Hancock Gravel & Ready Mix → HANCOCK GRAVEL & READY MIX; 1991-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jay  Hancock  et al → HANCOCK GRAVEL & READY MIX; 1991-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay  Hancock  et al → Hancock Gravel & Ready Mix; 1991-12-04 to current/open; source msha-controller-operator-history