# Relationship history for MSHA mine 0404774

Current hierarchy: **Cooke Charles B → C & C Construction Corp → Pilot Knob Quarry**

- 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

- **controller_controls_mine:** United States Government → Pilot Knob Quarry; 1980-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Bureau Of Reclamation → Pilot Knob Quarry; 1985-10-01 to 1986-11-19; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Bureau Of Reclamation; 1985-10-01 to 1986-11-19; source msha-controller-operator-history
- **operator_operates_mine:** C & C Construction Corp → Pilot Knob Quarry; 1986-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cooke Charles B → Pilot Knob Quarry; 1986-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cooke Charles B → C & C Construction Corp; 1986-11-20 to current/open; source msha-controller-operator-history