# Relationship history for MSHA mine 1500092

Current hierarchy: **Roy  Beard → Gaddie-Shamrock LLC → Grider 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Gaddie-Shamrock Llc → Grider Quarry; 1950-01-01 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Beard et al → Grider Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Beard et al → Gaddie-Shamrock Llc; 1950-01-01 to 1985-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Gaddie-Shamrock Inc → Grider Quarry; 1986-01-01 to 2013-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Beard Moorman Et Al → Grider Quarry; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beard Moorman Et Al → Gaddie-Shamrock Inc; 1986-01-01 to 2013-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Gaddie-Shamrock LLC → Grider Quarry; 2013-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Beard et al → Gaddie-Shamrock LLC; 2013-06-24 to current/open; source msha-controller-operator-history