# Relationship history for MSHA mine 3003451

Current hierarchy: **Bruce  Weakley → WEAKLEY SAND & GRAVEL → COLD BROOK PIT**

- 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

- **operator_operates_mine:** David Eckler Co → COLD BROOK PIT; 2003-05-28 to 2016-04-18; source msha-controller-operator-history
- **controller_controls_mine:** David H  Eckler → COLD BROOK PIT; 2003-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David H  Eckler → David Eckler Co; 2003-05-28 to 2016-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Weakley Sand & Gravel → COLD BROOK PIT; 2016-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce  Weakley → COLD BROOK PIT; 2016-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Weakley → Weakley Sand & Gravel; 2016-04-19 to current/open; source msha-controller-operator-history