# Relationship history for MSHA mine 0600649

Current hierarchy: **Michael W Precourt; Charles A Precourt → Charles J Precourt & Son Inc → Sterling Stone 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** J Joslyn & Sons → Sterling Stone Quarry; 1995-11-01 to 2004-12-31; source msha-controller-operator-history
- **controller_controls_mine:** M John  Joslyn → Sterling Stone Quarry; 1995-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M John  Joslyn → J Joslyn & Sons; 1995-11-01 to 2004-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Charles J Precourt & Son Inc → Sterling Stone Quarry; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael W Precourt et al → Sterling Stone Quarry; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael W Precourt et al → Charles J Precourt & Son Inc; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles A Precourt et al → Charles J Precourt & Son Inc; 2005-01-01 to current/open; source msha-controller-operator-history