# Relationship history for MSHA mine 0901162

Current hierarchy: **John Ritchard  Menscer → Millennium Quarries → Sandy Cross 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:** Calvin  Hill et al → Sandy Cross Quarry; 1950-01-01 to 2018-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Quarries Inc → Sandy Cross Quarry; 2005-07-18 to 2014-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Calvin  Hill et al → Quarries Inc; 2005-07-18 to 2014-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Millennium Quarries → Sandy Cross Quarry; 2014-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John Ritchard  Menscer → Sandy Cross Quarry; 2014-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Ritchard  Menscer → Millennium Quarries; 2014-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Hill et al → Sandy Cross Quarry; 2018-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Hill et al → Quarries Inc; 2018-04-30 to 2014-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Doris Ann  Gunter et al → Quarries Inc; 2018-04-30 to 2014-04-22; source msha-controller-operator-history