class Machine(Base):
        __tablename__='machine'

        id = Column(Integer, primary_key=True)
        name = Column(String(250), nullable=False)
        comment    = Column(String(250))
        tags       = Column(String(250), nullable=True)

class GeneralMeasurementData(Base):
        __tablename__='generalmeasurementdata'
        id = Column(Integer, primary_key=True)
        )

        ......
        machine_id   = Column(Integer, ForeignKey('machine.id'))
        machine = relationship(Machine)
        


-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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