# Relationship history for MSHA mine 2801031

Current hierarchy: **William H  Stone; Maureen L  Stone → Buck Mining & Materials Inc. → Buck Pit**

- 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

- **controller_controls_mine:** Fred  Vahlsing III → Buck Pit; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Excavating Materials and Equipment → Buck Pit; 2010-03-27 to 2011-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Vahlsing III → Excavating Materials and Equipment; 2010-03-27 to 2011-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Buck Mining & Materials Inc. → Buck Pit; 2011-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William H  Stone et al → Buck Pit; 2011-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William H  Stone et al → Buck Mining & Materials Inc.; 2011-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maureen L  Stone et al → Buck Mining & Materials Inc.; 2011-08-23 to current/open; source msha-controller-operator-history