# Relationship history for MSHA mine 1200739

Current hierarchy: **Carolyn S  Fryback; Walter Craig  Coshow → Meshberger Brothers Stone Corp → Meshberger Brothers Stone Corp Pennville**

- 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

- **operator_operates_mine:** Meshberger Brothers Stone Corp → Meshberger Brothers Stone Corp Pennville; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carolyn S  Fryback et al → Meshberger Brothers Stone Corp Pennville; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carolyn S  Fryback et al → Meshberger Brothers Stone Corp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter Craig  Coshow et al → Meshberger Brothers Stone Corp; 1950-01-01 to current/open; source msha-controller-operator-history