# Relationship history for MSHA mine 4404924

Current hierarchy: **CRH PLC → Mountain Materials Inc → Saltville Stone Plant**

- 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:** Greer Lime Company → Saltville Stone Plant; 1950-01-01 to 1985-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Greer Industries Inc → Saltville Stone Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greer Industries Inc → Greer Lime Company; 1950-01-01 to 1985-06-03; source msha-controller-operator-history
- **controller_controls_mine:** W-L Construction & Paving Inc → Saltville Stone Plant; 1950-01-01 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_mine:** V D  Kendrick → Saltville Stone Plant; 1979-03-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kendrick Quarry → Saltville Stone Plant; 1985-06-04 to 1988-04-03; source msha-controller-operator-history
- **controller_controls_operator:** V D  Kendrick → Kendrick Quarry; 1985-06-04 to 1988-04-03; source msha-controller-operator-history
- **operator_operates_mine:** D W L Inc → Saltville Stone Plant; 1988-04-04 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_operator:** W-L Construction & Paving Inc → D W L Inc; 1988-04-04 to 1998-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Saltville Stone Inc → Saltville Stone Plant; 1999-01-01 to 2006-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Steve L  Lawson et al → Saltville Stone Plant; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve L  Lawson et al → Saltville Stone Inc; 1999-01-01 to 2006-01-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Saltville Stone Plant; 2006-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Materials Inc → Saltville Stone Plant; 2006-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Mountain Materials Inc; 2006-01-31 to current/open; source msha-controller-operator-history