# Relationship history for MSHA mine 4503014

Current hierarchy: **Heidelberg Materials AG → Cadman (Rock) Inc → Sky River 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:** Doug Connelly Sand & Gravel Company → Sky River Pit; 1983-11-01 to 1989-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Doug  Connelly → Sky River Pit; 1983-11-01 to 1989-03-27; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Connelly → Doug Connelly Sand & Gravel Company; 1983-11-01 to 1989-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Paul J  Taylor  et al → Sky River Pit; 1984-10-05 to 1991-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Cadman Rock Company Inc → Sky River Pit; 1989-03-28 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Taylor  et al → Cadman Rock Company Inc; 1989-03-28 to 1991-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Cadman (Rock) Inc → Sky River Pit; 1991-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Sky River Pit; 1991-01-02 to 2000-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Cadman (Rock) Inc; 1991-01-02 to 2000-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Sky River Pit; 2000-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Cadman (Rock) Inc; 2000-07-21 to current/open; source msha-controller-operator-history