# Relationship history for MSHA mine 4300106

Current hierarchy: **Peckham Industries Inc → Peckham Materials Corp → Coventry Plant 156**

- 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:** Calkins Sand & Gravel Inc → Coventry Plant 156; 1950-01-01 to 2025-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → Coventry Plant 156; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rita M  Calkins → Coventry Plant 156; 1950-01-01 to 2020-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Rita M  Calkins → Calkins Sand & Gravel Inc; 1950-01-01 to 2020-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Rita M Calkins Trust → Coventry Plant 156; 2020-01-29 to 2024-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Rita M Calkins Trust → Calkins Sand & Gravel Inc; 2020-01-29 to 2024-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Karen K Martel Revocable Trust → Coventry Plant 156; 2024-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen K Martel Revocable Trust → Calkins Sand & Gravel Inc; 2024-04-10 to 2025-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Peckham Materials Corp → Coventry Plant 156; 2025-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → Peckham Materials Corp; 2025-08-28 to current/open; source msha-controller-operator-history