# Relationship history for MSHA mine 3600164

Current hierarchy: **Robert L Ratoskey; Raymond  Trainor → Media Quarry Company Inc → Media Quarry Co. Inc.**

- 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:** Media Quarry Company Inc → Media Quarry Co. Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Scala → Media Quarry Co. Inc.; 1950-01-01 to 2019-02-09; source msha-controller-operator-history
- **controller_controls_operator:** John W  Scala → Media Quarry Company Inc; 1950-01-01 to 2019-02-09; source msha-controller-operator-history
- **controller_controls_mine:** John G  Scala → Media Quarry Co. Inc.; 2019-02-10 to 2021-10-28; source msha-controller-operator-history
- **controller_controls_operator:** John G  Scala → Media Quarry Company Inc; 2019-02-10 to 2021-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Joan S  McGonigle et al → Media Quarry Co. Inc.; 2021-10-29 to 2022-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Joan S  McGonigle et al → Media Quarry Company Inc; 2021-10-29 to 2022-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Brian W  Bourquin et al → Media Quarry Company Inc; 2021-10-29 to 2022-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Lisa A  Scala et al → Media Quarry Company Inc; 2021-10-29 to 2022-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Joan L Scala McGonigle et al → Media Quarry Co. Inc.; 2022-03-04 to 2023-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Joan L Scala McGonigle et al → Media Quarry Company Inc; 2022-03-04 to 2023-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Jean M Bourquin et al → Media Quarry Company Inc; 2022-03-04 to 2023-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Lisa A Scala et al → Media Quarry Company Inc; 2022-03-04 to 2023-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Trainor et al → Media Quarry Co. Inc.; 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Trainor et al → Media Quarry Company Inc; 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L Ratoskey et al → Media Quarry Company Inc; 2023-01-05 to current/open; source msha-controller-operator-history