# Relationship history for MSHA mine 4201638

Current hierarchy: **Samuel  Feller → Feller Stone → 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

- **operator_operates_mine:** Lava Products Inc → Portable; 1979-11-01 to 1995-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Donald J  Larkin → Portable; 1979-11-01 to 1995-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Donald J  Larkin → Lava Products Inc; 1979-11-01 to 1995-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Lemuel  Leavittt → Portable; 1985-09-01 to 1999-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Feller Stone Inc → Portable; 1995-01-04 to 1997-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Allen  C  Feller → Portable; 1995-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen  C  Feller → Feller Stone Inc; 1995-01-04 to 1997-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Leavitt Construction → Portable; 1997-12-03 to 1999-02-03; source msha-controller-operator-history
- **controller_controls_operator:** Lemuel  Leavittt → Leavitt Construction; 1997-12-03 to 1999-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Feller Stone Inc → Portable; 1999-02-04 to 2022-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Allen  C  Feller → Feller Stone Inc; 1999-02-04 to 2022-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Feller Stone → Portable; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Samuel  Feller → Portable; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel  Feller → Feller Stone; 2022-05-10 to current/open; source msha-controller-operator-history