The trustee or trustees of any employee-benefit plan, such as a pension, welfare, profit sharing, share, purchase, or other plan, may transfer any part of the property and assets of the plan, in trust, to a corporate trustee which shall be a bank and trust company or trust company, incorporated under the laws of Pennsylvania, or a national banking association, having fiduciary powers and having its principal office in Pennsylvania, and may authorize such corporate trustee to invest and reinvest such property and assets subject to the same powers, restrictions and obligations with respect to investment and reinvestment of such property and assets as are applicable to the trustee or trustees making such transfer, and to contribute such property and assets to any common trust fund which the transferee may be otherwise authorized to maintain and to pay over the net income therefrom at such intervals as may be agreed: Provided, however, That such transfer in trust may be at any time revoked by action of the trustee or trustees so making transfer.