Document:

<PAGE>

                                                                   EXHIBIT 10.37

                           [LETTERHEAD OF BANK EXIM]

                                $25,000,000.00

                                BANK GUARANTEE
                                --------------
                              NO **6/***-**/*/**

CURRENCY       :UNITED STATES DOLLARS
AMOUNT         :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED AT      :JAKARTA-INDONESIA
ISSUED DATE    :OCTOBER 21, 1998
MATURITY DATE  :OCTOBER 21, 2000

FOR VALUE RECEIVED, WE THE UNDERSIGNED, PT. BANK EKSPOR IMPOR INDONESIA
(PERSERO) JAKARTA PLAZA EXIM BRANCH, JL JEND. GATOT SUBROTO KAV. 36-38
INDONESIA, HEREBY ISSUE OUR IRREVOCABLE, UNCONDITIONAL, TRANSFERABLE DIVISIBLE
AND WITHOUT PROTEST OR NOTIFICATION PROMISE TO PAY AGAINST THIS BANK GUARANTEE
TO THE ORDER OF ***** ***** THE BEARER OR HOLDER THERE OF WILL BE PAID AT
MATURITY OCTOBER 21, 1998 TO OCTOBER 21, 2000 THE SUM OF US$ 25,000,000.00 (US
DOLLARS TWENTY FIVE MILLION) IN THE LAWFUL CURRENCY OF THE UNITED STATES OF
AMERICA.

UPON PRESENTATION AND SURRENDER OF THIS BANK GUARANTEE AT THE OFFICE OF PT. BANK
EKSPOR IMPOR INDONESIA (PERSERO), PLAZA EXIM BRANCH IL. JEND. GATOT SUBROTO
KAV. 36-38 JAKARTA-INDONESIA SUCH PAYMENT SHALL BE MADE WITHOUT SET OFF AND
CLEAR OFF ANY DEDUCTIONS OR CHARGES, FEES OR DEDUCTION OR WITHHOLDING OF ANY
NATURE NOW OR HEREAFTER IMPOSED OR LEVIED, COLLECTED, WITHHELD OR ASSESSED BY
THE GOVERNMENT OF REPUBLIC OF INDONESIA, OR ANY POLITICAL SUBDIVISION OR
AUTHORITY THEREOF THEREIN.

THIS GUARANTEE IS SUBJECT TO THE UNIFORM CUSTOMS AND PRACTICE FOR DOCUMENTARY
SECURITIES (1993 REVISION) INTERNATIONAL CHAMBER OF COMMERCE, PUBLICATION NUMBER
ICC 500.

FOR AND ON BEHALF OF
PT BANK EKSPOR IMPOR (PERSERO)
   JAKARTA PLAZA EXIM BRANCH

           [SEAL]

/s/ *****            /s/ *****
-----------------    ---------------
      B.43.B             B.64.1

ENDORSEMENT BANK INDONESIA
           [SEAL]

/S/ *****
--------------------------<PAGE>

                                                                   EXHIBIT 10.38

                           [LETTERHEAD OF BANK EXIM]

                                $25,000,000.00

                                BANK GUARANTEE
                                --------------
                             NO. **7/****-**/*/**

CURRENCY       :UNITED STATES DOLLARS
AMOUNT         :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED AT      :JAKARTA-INDONESIA
ISSUED DATE    :OCTOBER 21, 1998
MATURITY DATE  :OCTOBER 21, 2000

FOR VALUE RECEIVED, WE THE UNDERSIGNED, PT. BANK EKSPOR IMPOR INDONESIA
(PERSERO) JAKARTA PLAZA EXIM BRANCH, JL. JEND. GATOT SUBROTO KAV. 36-38
INDONESIA, HEREBY ISSUE OUR IRREVOCABLE, UNCONDITIONAL, TRANSFERABLE DIVISIBLE
AND WITHOUT PROTEST OR NOTIFICATION PROMISE TO PAY AGAINST THIS BANK GUARANTEE
TO THE ORDER OF **** **** THE BEARER OR HOLDER THERE OF WILL BE PAID AT MATURITY
OCTOBER 21, 1998 TO OCTOBER 21, 2000 THE SUM OF US$ 25,000,000.00 (US DOLLARS
TWENTY FIVE MILLION) IN THE LAWFUL CURRENCY OF THE UNITED STATES OF AMERICA.

UPON PRESENTATION AND SURRENDER OF THIS BANK GUARANTEE AT THE OFFICE OF PT. BANK
EKSPOR IMPOR INDONESIA (PERSERO), PLAZA EXIM BRANCH IL. JEND. GATOT SUBROTO
KAV. 36-38 JAKARTA-INDONESIA SUCH PAYMENT SHALL BE MADE WITHOUT SET OFF AND
CLEAR OFF ANY DEDUCTIONS OR CHARGES, FEES OR DEDUCTION OR WITHHOLDING OF ANY
NATURE NOW OR HEREAFTER IMPOSED OR LEVIED, COLLECTED, WITHHELD OR ASSESSED BY
THE GOVERNMENT OF REPUBLIC OF INDONESIA, OR ANY POLITICAL SUBDIVISION OR
AUTHORITY THEREOF THEREIN.

THIS GUARANTEE IS SUBJECT TO THE UNIFORM CUSTOMS AND PRACTICE FOR DOCUMENTARY
SECURITIES (1993 REVISION) INTERNATIONAL CHAMBER OF COMMERCE, PUBLICATION NUMBER
ICC 500.

FOR AND ON BEHALF OF
PT. BANK EKSPOR IMPOR (PERSERO)
   JAKARTA PLAZA EXIM BRANCH

           [SEAL]

/s/ ****             /s/ ****
-----------------    -----------------
      B.43.B              B.64.1

ENDORSEMENT BANK INDONESIA
           [SEAL]

/s/ ****
--------------------------<PAGE>

                                                                   EXHIBIT 10.39

                           [LETTERHEAD OF BANK EXIM]

                                $25,000,000.00

                                BANK GUARANTEE
                                --------------
                              NO **8/****-**/*/**

CURRENCY       :UNITED STATES DOLLARS
AMOUNT         :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED AT      :JAKARTA-INDONESIA
ISSUED DATE    :OCTOBER 21, 1998
MATURITY DATE  :OCTOBER 21, 2000

FOR VALUE RECEIVED, WE THE UNDERSIGNED, PT. BANK EKSPOR IMPOR INDONESIA
(PERSERO) JAKARTA PLAZA EXIM BRANCH, JL. JEND GATOT SUBROTO KAV. 36-38
INDONESIA, HEREBY ISSUE OUR IRREVOCABLE, UNCONDITIONAL, TRANSFERABLE DIVISIBLE
AND WITHOUT PROTEST OR NOTIFICATION PROMISE TO PAY AGAINST THIS BANK GUARANTEE
TO THE ORDER OF **** **** THE BEARER OR HOLDER THERE OF WILL BE PAID AT MATURITY
OCTOBER 21, 1998 TO OCTOBER 21, 2000 THE SUM OF US$ 25,000,000.00 (US DOLLARS
TWENTY FIVE MILLION) IN THE LAWFUL CURRENCY OF THE UNITED STATES OF AMERICA.

UPON PRESENTATION AND SURRENDER OF THIS BANK GUARANTEE AT THE OFFICE OF PT. BANK
EKSPOR IMPOR INDONESIA (PERSERO), PLAZA EXIM BRANCH JL. JEND. GATOT SUBROTO
KAV. 36-38 JAKARTA-INDONESIA SUCH PAYMENT SHALL BE MADE WITHOUT SET OFF AND
CLEAR OFF ANY DEDUCTIONS OR CHARGES, FEES OR DEDUCTION OR WITHHOLDING OF ANY
NATURE NOW OR HEREAFTER IMPOSED OR LEVIED, COLLECTED, WITHHELD OR ASSESSED BY
THE GOVERNMENT OF REPUBLIC OF INDONESIA, OR ANY POLITICAL SUBDIVISION OR
AUTHORITY THEREOF THEREIN.

THIS GUARANTEE IS SUBJECT TO THE UNIFORM CUSTOMS AND PRACTICE FOR DOCUMENTARY
SECURITIES (1993 REVISION) INTERNATIONAL CHAMBER OF COMMERCE, PUBLICATION NUMBER
ICC 500.

FOR AND ON BEHALF OF
PT BANK EKSPOR IMPOR (PERSERO)
   JAKARTA PLAZA EXIM BRANCH

           [SEAL]

/s/ ****               /s/ ****
-----------------      -----------------
     B.43.8                 B.64.1

ENDORSEMENT BANK INDONESIA
           [SEAL]

/s/ ****
--------------------------<PAGE>

                                                                   EXHIBIT 10.40

                           [LETTERHEAD OF BANK EXIM]

                                $25,000,000.00

                                BANK GUARANTEE
                                --------------
                              NO. **9/****-**/*/**

CURRENCY       :UNITED STATES DOLLARS
AMOUNT         :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED AT      :JAKARTA-INDONESIA
ISSUED DATE    :OCTOBER 21, 1998
MATURITY DATE  :OCTOBER 21, 2000

FOR VALUE RECEIVED, WE THE UNDERSIGNED, PT. BANK EKSPOR IMPOR INDONESIA
(PERSERO) JAKARTA PLAZA EXIM BRANCH, JL. JEND. GATOT SUBROTO KAV. 36-38
INDONESIA, HEREBY ISSUE OUR IRREVOCABLE, UNCONDITIONAL, TRANSFERABLE DIVISIBLE
AND WITHOUT PROTEST OR NOTIFICATION PROMISE TO PAY AGAINST THIS BANK GUARANTEE
TO THE ORDER OF **** **** THE BEARER OR HOLDER THERE OF WILL BE PAID AT MATURITY
OCTOBER 21, 1998 TO OCTOBER 21, 2000 THE SUM OF US$ 25,000,000.00 (US DOLLARS
TWENTY FIVE MILLION) IN THE LAWFUL CURRENCY OF THE UNITED STATES OF AMERICA.

UPON PRESENTATION AND SURRENDER OF THIS BANK GUARANTEE AT THE OFFICE OF PT. BANK
EKSPOR IMPOR INDONESIA (PERSERO), PLAZA EXIM BRANCH JL. JEND. GATOT SUBROTO
KAV. 36-38 JAKARTA-INDONESIA SUCH PAYMENT SHALL BE MADE WITHOUT SET OFF AND
CLEAR OFF ANY DEDUCTIONS OR CHARGES, FEES OR DEDUCTION OR WITHHOLDING OF ANY
NATURE NOW OR HEREAFTER IMPOSED OR LEVIED, COLLECTED, WITHHELD OR ASSESSED BY
THE GOVERNMENT OF REPUBLIC OF INDONESIA, OR ANY POLITICAL SUBDIVISION OR
AUTHORITY THEREOF THEREIN.

THIS GUARANTEE IS SUBJECT TO THE UNIFORM CUSTOMS AND PRACTICE FOR DOCUMENTARY
SECURITIES (1993 REVISION) INTERNATIONAL CHAMBER OF COMMERCE, PUBLICATION NUMBER
ICC 500.

FOR AND ON BEHALF OF
PT. BANK EKSPOR IMPOR (PERSERO)
   JAKARTA PLAZA EXIM BRANCH

           [SEAL]

/s/ ****               /s/ ****
-----------------      ----------------
     B.43.8                 B.64.1

ENDORSEMENT BANK INDONESIA
           [SEAL]

/s/ ****
---------------------------<PAGE>

                                                                   EXHIBIT 10.41

                           [LETTERHEAD OF BANK EXIM]

                           LETTER OR AUTHENTICATION

WE, PT. BANK EKSPOR IMPOR INDONESIA (PERSERO) WITH FULL BANK RESPONSIBILITY AND
AUTHORITY, IRREVOCABLE CONFIRM THAT:

BANK GUARANTEE NO.    :**6/****-**/*/**
AMOUNT                :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED DATE           :OCTOBER 21, 1998
MATURITY DATE         :OCTOBER 21, 2000

BANK GUARANTEE NO.    :**7/****-**/*/**
AMOUNT                :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED DATE           :OCTOBER 21, 1998
MATURITY DATE         :OCTOBER 21, 2000

IS GENUINE, CAN BE VERIFIED AND CONFIRMED BANK TO BANK THROUGH THE FOLLOWING
BANK COORDINATED:

BANK NAME             :PT. BANK EKSPOR IMPOR INDONESIA (PERSERO)
BANK ADDRESS          :JL. JEND. GATOT SUBROTO KAV 36-38
                       JAKARTA - INDONESIA
BANK OFFICERS         :SOFWAN ADIWIDJAJA
TELEPHONE NUMBER      :****
FACSIMILE NUMBER      :****
TELEX NUMBER          :****
S.W.I.F.T. CODE       :****

JAKARTA, OCTOBER 21, 1998

FOR AN ON BEHALF OF
PT. BANK EKSPOR IMPOR INDONESIA (PERSERO)
    JAKARTA PLAZA EXIM BRANCH

          [SEAL]

     /s/ ****
     -----------------
          B.43.B

ENDORSEMENT BANK INDONESIA
           [SEAL]

/s/ ****
--------------------------<PAGE>

                                                                   EXHIBIT 10.42

                           [LETTERHEAD OF BANK EXIM]

                           LETTER OR AUTHENTICATION

WE, PT. BANK EKSPOR IMPOR INDONESIA (PERSERO) WITH FULL BANK RESPONSIBILITY AND
AUTHORITY, IRREVOCABLE CONFIRM THAT:

BANK GUARANTEE NO.    :**8/****-**/*/**
AMOUNT                :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED DATE           :OCTOBER 21, 1998
MATURITY DATE         :OCTOBER 21, 2000

BANK GUARANTEE NO.    :**9/****-**/*/**
AMOUNT                :US$ 25,000,000.00 (US DOLLARS TWENTY FIVE MILLION)
ISSUED DATE           :OCTOBER 21, 1998
MATURITY DATE         :OCTOBER 21, 2000

IS GENUINE, CAN BE VERIFIED AND CONFIRMED BANK TO BANK THROUGH THE FOLLOWING
BANK COORDINATED:

BANK NAME             :PT. BANK EKSPOR IMPOR INDONESIA (PERSERO)
BANK ADDRESS          :JL. JEND. GATOT SUBROTO KAV 36-38
                       JAKARTA - INDONESIA
BANK OFFICERS         :SOFWAN ADIWIDJAJA
TELEPHONE NUMBER      :****
FACSIMILE NUMBER      :****
TELEX NUMBER          :****
S.W.I.F.T. CODE       :****

JAKARTA, OCTOBER 21, 1998

FOR AN ON BEHALF OF
PT. BANK EKSPOR IMPOR INDONESIA (PERSERO)
    JAKARTA PLAZA EXIM BRANCH

          [SEAL]

     /s/ ****
     -----------------
          B.43.B

ENDORSEMENT BANK INDONESIA
           [SEAL]

/s/ ****
--------------------------

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