# Relationship history for MSHA mine 1900015

Current hierarchy: **Peckham Industries Inc → John S Lane & Son → AMHERST QUARRY PLANT 43**

- 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

- **operator_operates_mine:** John S Lane & Son Incorporated → AMHERST QUARRY PLANT 43; 1950-01-01 to 2021-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Harry C  Lane et al → AMHERST QUARRY PLANT 43; 1950-01-01 to 2020-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Harry C  Lane et al → John S Lane & Son Incorporated; 1950-01-01 to 2020-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → AMHERST QUARRY PLANT 43; 2020-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → John S Lane & Son Incorporated; 2020-01-02 to 2021-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → AMHERST QUARRY PLANT 43; 2021-02-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** John S Lane & Son → AMHERST QUARRY PLANT 43; 2021-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → John S Lane & Son; 2021-02-22 to current/open; source msha-controller-operator-history