# Relationship history for MSHA mine 3600060

Current hierarchy: **A Ross  Myers → Allan Myers Materials → Devault 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

- **operator_operates_mine:** Granite Industries Inc → Devault Quarry; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Peckham William C → Devault Quarry; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Peckham William C → Granite Industries Inc; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Burlington Aggregates Inc → Devault Quarry; 1978-12-01 to 1982-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Narozanick → Devault Quarry; 1978-12-01 to 1984-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Narozanick → Burlington Aggregates Inc; 1978-12-01 to 1982-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Devault Crushed Stone Company Inc → Devault Quarry; 1982-12-15 to 1995-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Hess → Devault Quarry; 1982-12-15 to 1995-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Hess → Devault Crushed Stone Company Inc; 1982-12-15 to 1995-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Independence Construction Materials → Devault Quarry; 1995-05-04 to 2017-05-10; source msha-controller-operator-history
- **controller_controls_mine:** A Ross  Myers → Devault Quarry; 1995-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Ross  Myers → Independence Construction Materials; 1995-05-04 to 2017-05-10; source msha-controller-operator-history
- **controller_controls_mine:** A Ross  Myers → Devault Quarry; 2007-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Allan Myers Materials → Devault Quarry; 2017-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Ross  Myers → Allan Myers Materials; 2017-05-11 to current/open; source msha-controller-operator-history