# Relationship history for MSHA mine 3608911

Current hierarchy: **Stacey  McClain → S. McClain Stone → Canfield Quarries**

- 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:** Canfield Quarries → Canfield Quarries; 2001-03-01 to 2022-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Olin  Canfield → Canfield Quarries; 2001-03-01 to 2007-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Olin  Canfield → Canfield Quarries; 2001-03-01 to 2007-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Stacey  McClain → Canfield Quarries; 2005-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott D  Johnson  et al → Canfield Quarries; 2007-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott D  Johnson  et al → Canfield Quarries; 2007-05-15 to 2022-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Johnson  et al → Canfield Quarries; 2007-05-15 to 2022-01-11; source msha-controller-operator-history
- **operator_operates_mine:** S. McClain Stone → Canfield Quarries; 2022-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacey  McClain → S. McClain Stone; 2022-01-12 to current/open; source msha-controller-operator-history