# Relationship history for MSHA mine 1201129

Current hierarchy: **Gunsaullus David → Daveco Materials & Construction Inc → Ligonier Pit & 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:** Stone-Street Gravel Inc → Ligonier Pit & Mill; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Bercot → Ligonier Pit & Mill; 1950-01-01 to 1987-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Bercot → Stone-Street Gravel Inc; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Daveco Materials & Construction Inc → Ligonier Pit & Mill; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gunsaullus David → Ligonier Pit & Mill; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gunsaullus David → Daveco Materials & Construction Inc; 1978-04-01 to current/open; source msha-controller-operator-history