# Relationship history for MSHA mine 2103090

Current hierarchy: **Wayne  Johnson; Sara  Becker; John  Becker → Johnson Aggregates Incorporated → Johnson Portable**

- 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:** Wayne F  Johnson → Johnson Portable; 1950-01-01 to 2017-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Aggregates Incorporated → Johnson Portable; 1994-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne F  Johnson → Johnson Aggregates Incorporated; 1994-11-01 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Spear et al → Johnson Portable; 2018-01-01 to 2022-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Spear et al → Johnson Aggregates Incorporated; 2018-01-01 to 2022-07-10; source msha-controller-operator-history
- **controller_controls_operator:** John  Becker et al → Johnson Aggregates Incorporated; 2018-01-01 to 2022-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Johnson et al → Johnson Portable; 2022-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Johnson et al → Johnson Aggregates Incorporated; 2022-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sara  Becker et al → Johnson Aggregates Incorporated; 2022-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Becker et al → Johnson Aggregates Incorporated; 2022-07-11 to current/open; source msha-controller-operator-history