| (i) | Prime      Rate.  The term “Prime Rate” as used herein shall mean a      rate per annum equal to the base, prime or index commercial loan interest      rate established and published or announced as such from time to time by      Citibank, N.A., in New York, New York, or its successor (“Citibank”), and      is not necessarily the lowest interest rate charged by Citibank on      commercial loans.  If Citibank should have more than one      established and published or announced base or prime commercial loan rate,      the “Base Rate” herein shall mean Citibank’s highest established and      published or announced base or prime commercial loan      rate.  Without notice to Maker or any other party, Prime Rate      shall automatically fluctuate upward and downward as and in the amount by      which said base or prime commercial loan rate shall    fluctuate. |
|-----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (ii) | Maximum      Rate.  The term “Maximum Rate” as used herein shall mean      the maximum rate of interest permitted from time to time by applicable      law. |
|------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (iii) | Applicable Interest      Rate.  The term “Applicable Interest Rate” as used herein      shall mean the rate, which shall from day to day be at the annual rate      equal to the lesser of thefollowing: |
|-------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (a) | the      Maximum Rate; or |
|-----|---------------------------|

| (b) | the      sum of one percent (1%) plus the PrimeRate; |
|-----|------------------------------------------------------|

| 2. | Payment.  This      note is due and payable as follows: |
|----|-------------------------------------------------------------------|

| (i) | Interest      on the principal sum of this Note is due and payable annually as it      accrues during the term hereof in annual installments commencing one year      from the date hereof and continuing on each annual anniversary date      thereafter.  Notwithstanding, in the event Maker does not have      sufficient cash flow to make an interest payment under this paragraph      2(i), Maker shall have the right to defer such payment, with interest,      until such time as cash flow is available to make such payment, but not      later than three (3) years from the date hereof (the "Maturity      Date"); |
|-----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (ii) | All      unpaid and outstanding principal on this Note and all accrued and unpaid      interest on such principal amount shall be due and payable on the Maturity      Date; and |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (ii) | The      Note may be prepaid in whole or in part at any time during the term      hereof. |
|--------|------|-------------------------------------------------------------------------------------------|

| (i) | Default      in the payment of any installment of principal or interest when      due; |
|-----|----------------------------------------------------------------------------------------|

| (ii) | Default      in the performance of any of the covenants or provisions of, or the      occurrence of any default or event of default under, the Pledge Agreement      or any other deed of trust, mortgage, or other agreement securing this      Note or evidencing the indebtedness created hereby;  or |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (iii) | The      bankruptcy or insolvency of, the assignment for the benefit of creditors      by, or the appointment of a receiver for any receiver for any property of      any party liable for the payment of this Note, whether as maker, endorser,      guarantor, surety, or otherwise; or |
|-------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| PAYEE:                           |   | MAKER:                        |
|----------------------------------|--------|-------------------------------|
|                             |   |                          |
| John      David Davenport        |   | KES,      Inc.                |
| 1103      W. Saint Andrews Drive |   | c/o      Landmark National    |
| Edmond,      Oklahoma 73003      |   | 2817      Crain Highway       |
|                             |   | Upper      Marlboro, MD 20774 |