# Relationship history for MSHA mine 5100011

Current hierarchy: **James W Glover Holding Company Ltd → Jas. W Glover Ltd. → Bluestone Quarry & Mill**

- 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:** Grove Farm Rock Company → Bluestone Quarry & Mill; 1950-01-01 to 1998-07-19; source msha-controller-operator-history
- **controller_controls_mine:** David W  Pratt → Bluestone Quarry & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David W  Pratt → Grove Farm Rock Company; 1950-01-01 to 1998-07-19; source msha-controller-operator-history
- **controller_controls_mine:** James W Glover Holding Company Ltd → Bluestone Quarry & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jas. W Glover Ltd. → Bluestone Quarry & Mill; 1998-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W Glover Holding Company Ltd → Jas. W Glover Ltd.; 1998-07-20 to current/open; source msha-controller-operator-history