# Relationship history for MSHA mine 0404930

Current hierarchy: **Penny J  Holliday → Holliday Rock Company Inc → Holliday Rock-Little Rock 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Penny J  Holliday et al → Holliday Rock-Little Rock Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** State Sand & Gravel Company Inc → Holliday Rock-Little Rock Plant; 1988-03-01 to 1996-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Charles B  Siroonian → Holliday Rock-Little Rock Plant; 1988-03-01 to 1996-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Charles B  Siroonian → State Sand & Gravel Company Inc; 1988-03-01 to 1996-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Rock Company Inc → Holliday Rock-Little Rock Plant; 1996-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Penny J  Holliday et al → Holliday Rock Company Inc; 1996-10-16 to current/open; source msha-controller-operator-history