# Relationship history for MSHA mine 1901115

Current hierarchy: **Peckham Industries Inc → Palmer Paving Corp → Palmer Paving Corp Warren Quarry**

- 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

- **controller_controls_mine:** Callahan David → Palmer Paving Corp Warren Quarry; 1950-01-01 to 2018-09-17; source msha-controller-operator-history
- **operator_operates_mine:** MOUNT TOM ROCK, LLC → Palmer Paving Corp Warren Quarry; 2002-05-13 to 2020-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Jerome J  Gagliarducci et al → Palmer Paving Corp Warren Quarry; 2002-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome J  Gagliarducci et al → MOUNT TOM ROCK, LLC; 2002-05-13 to 2020-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → Palmer Paving Corp Warren Quarry; 2018-09-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Palmer Paving Corp. → Palmer Paving Corp Warren Quarry; 2020-04-13 to 2021-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → Palmer Paving Corp.; 2020-04-13 to 2021-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Callahan David → Palmer Paving Corp.; 2020-04-13 to 2018-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → Palmer Paving Corp Warren Quarry; 2021-02-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Palmer Paving Corp → Palmer Paving Corp Warren Quarry; 2021-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → Palmer Paving Corp; 2021-02-22 to current/open; source msha-controller-operator-history