# Relationship history for MSHA mine 1103036

Current hierarchy: **Infrastructure and Energy Alternatives, Inc → William Charles Construction - Materials Division → 11776**

- 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:** William Charles Ltd → 11776; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rockford Sand & Gravel Inc → 11776; 1999-02-01 to 2009-02-28; source msha-controller-operator-history
- **controller_controls_operator:** William Charles Ltd → Rockford Sand & Gravel Inc; 1999-02-01 to 2009-02-28; source msha-controller-operator-history
- **operator_operates_mine:** William Charles Construction - Materials Division → 11776; 2009-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William Charles Ltd → 11776; 2009-03-01 to 2018-12-12; source msha-controller-operator-history
- **controller_controls_operator:** William Charles Ltd → William Charles Construction - Materials Division; 2009-03-01 to 2018-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Infrastructure and Energy Alternatives, Inc → 11776; 2018-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Infrastructure and Energy Alternatives, Inc → William Charles Construction - Materials Division; 2018-12-13 to current/open; source msha-controller-operator-history