# Relationship history for MSHA mine 4300304

Current hierarchy: **Peckham Industries Inc → Peckham Materials Corp → Lyndonville Plant 151**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Peckham Industries Inc → Lyndonville Plant 151; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calkins Rock Products Inc → Lyndonville Plant 151; 1978-03-09 to 2026-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Rita M  Calkins → Lyndonville Plant 151; 1978-03-09 to 2020-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Rita M  Calkins → Calkins Rock Products Inc; 1978-03-09 to 2020-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Rita M Calkins Trust → Lyndonville Plant 151; 2020-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rita M Calkins Trust → Calkins Rock Products Inc; 2020-01-29 to 2026-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Peckham Materials Corp → Lyndonville Plant 151; 2026-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → Peckham Materials Corp; 2026-01-15 to current/open; source msha-controller-operator-history