# Relationship history for MSHA mine 3401214

Current hierarchy: **Philip J  Schwarz Et At; Gene J  Schwarz → Schwarz Ready Mix Of Okc Inc → Schwarz #3**

- 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:** Haskell Lemon Construction Company → Schwarz #3; 1980-01-01 to 1985-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Larry H  Lemon  et al → Schwarz #3; 1980-01-01 to 1985-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Larry H  Lemon  et al → Haskell Lemon Construction Company; 1980-01-01 to 1985-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Philip J  Schwarz Et At → Schwarz #3; 1983-02-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Riverside Sand Company → Schwarz #3; 1985-04-19 to 1988-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Lindsey → Schwarz #3; 1985-04-19 to 1988-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Lindsey → Riverside Sand Company; 1985-04-19 to 1988-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Riverside Sand Company → Schwarz #3; 1988-10-03 to 1993-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Stephens → Schwarz #3; 1988-10-03 to 1993-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Stephens → Riverside Sand Company; 1988-10-03 to 1993-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Schwarz Ready Mix Of Okc Inc → Schwarz #3; 1993-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip J  Schwarz Et At → Schwarz Ready Mix Of Okc Inc; 1993-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene J  Schwarz Et Al → Schwarz Ready Mix Of Okc Inc; 1993-06-15 to current/open; source msha-controller-operator-history