# Relationship history for MSHA mine 3609764

Current hierarchy: **Terry L  Schall → Big Mack Leasing Co., Inc. → Shop**

- 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:** Terry L  Schall → Shop; 1993-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MBS Repairs Inc. → Shop; 2009-04-07 to 2013-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Margaret S.  Schall et al → Shop; 2009-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret S.  Schall et al → MBS Repairs Inc.; 2009-04-07 to 2013-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Swartfager et al → MBS Repairs Inc.; 2009-04-07 to 2013-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Sean M.  Murray et al → MBS Repairs Inc.; 2009-04-07 to 2013-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Big Mack Leasing Co., Inc. → Shop; 2013-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Schall → Big Mack Leasing Co., Inc.; 2013-03-15 to current/open; source msha-controller-operator-history