# Relationship history for MSHA mine 1700379

Current hierarchy: **Timothy H Gott → Doug Gott & Sons Inc → Doug Gott & Sons Inc Portable SC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Maine Department Of Transportation → Doug Gott & Sons Inc Portable SC; 1950-01-01 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_mine:** State Of Maine → Doug Gott & Sons Inc Portable SC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** State Of Maine → Maine Department Of Transportation; 1950-01-01 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Douglas A  Gott  et al → Doug Gott & Sons Inc Portable SC; 1978-03-09 to 2012-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Calvin R Smith → Doug Gott & Sons Inc Portable SC; 1978-09-01 to 1978-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Smith Calvin R → Doug Gott & Sons Inc Portable SC; 1978-09-01 to 1978-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Smith Calvin R → Calvin R Smith; 1978-09-01 to 1978-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Doug Gott & Sons Inc → Doug Gott & Sons Inc Portable SC; 1978-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas A  Gott  et al → Doug Gott & Sons Inc; 1978-11-18 to 2012-07-26; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Gott et al → Doug Gott & Sons Inc Portable SC; 2012-07-27 to 2024-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Gott et al → Doug Gott & Sons Inc; 2012-07-27 to 2024-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Gott et al → Doug Gott & Sons Inc; 2012-07-27 to 2024-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Gott et al → Doug Gott & Sons Inc; 2012-07-27 to 2024-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Timothy H Gott → Doug Gott & Sons Inc Portable SC; 2024-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy H Gott → Doug Gott & Sons Inc; 2024-11-05 to current/open; source msha-controller-operator-history