# Relationship history for MSHA mine 1800685

Current hierarchy: **Duduk Fontaine Art & Walter Kennel → Eastern Shore Concrete & Building Products Inc → Hurlock 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:** Fooks Concrete Sand & Gravel → Hurlock Pit; 1981-05-01 to 1989-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Fooks Lloyd → Hurlock Pit; 1981-05-01 to 1989-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Fooks Lloyd → Fooks Concrete Sand & Gravel; 1981-05-01 to 1989-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Fooks Sand & Gravel Inc → Hurlock Pit; 1989-06-13 to 1991-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Flaharty Lawrence → Hurlock Pit; 1989-06-13 to 1991-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Flaharty Lawrence → Fooks Sand & Gravel Inc; 1989-06-13 to 1991-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Shore Concrete & Building Products Inc → Hurlock Pit; 1991-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duduk Fontaine Art & Walter Kennel → Hurlock Pit; 1991-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duduk Fontaine Art & Walter Kennel → Eastern Shore Concrete & Building Products Inc; 1991-04-22 to current/open; source msha-controller-operator-history