# Relationship history for MSHA mine 4702923

Current hierarchy: **Hendricks Holding Company Inc → Corporate Contractors, Inc → Corporate Contractors Inc., Quarry Div.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Custom Ditching Inc → Corporate Contractors Inc., Quarry Div.; 1991-03-01 to 2012-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Halderson → Corporate Contractors Inc., Quarry Div.; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Halderson → Custom Ditching Inc; 1991-03-01 to 2012-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Corporate Contractors, Inc → Corporate Contractors Inc., Quarry Div.; 2012-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hendricks Holding Company Inc → Corporate Contractors Inc., Quarry Div.; 2012-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hendricks Holding Company Inc → Corporate Contractors, Inc; 2012-04-01 to current/open; source msha-controller-operator-history