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        <PersonNm>JOHN HENRY</PersonNm>
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        <PersonNm>LAURIE J LANDEAU</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
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        <PersonNm>FRANK LIPIECKI</PersonNm>
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        <PersonNm>FRED A MIDDLETON</PersonNm>
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        <PersonNm>LOUISE Y PALMER</PersonNm>
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        <PersonNm>OCTAVIO TONATIUH RAMIEREZ-REIVICH</PersonNm>
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        <PersonNm>CATHERINE SOHN</PersonNm>
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        <PersonNm>JEFFREY L STURCHIO</PersonNm>
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        <PersonNm>MARY TANNER</PersonNm>
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        <PersonNm>CHERYL TEICH</PersonNm>
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        <PersonNm>SAM THARPE</PersonNm>
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        <PersonNm>DAVID COLE</PersonNm>
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        <PersonNm>STEPHANIE KISH</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CAITLIN MARTIN</PersonNm>
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        <PersonNm>KEVIN CAVANAUGH</PersonNm>
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        <PersonNm>MICHELLE DIMEO</PersonNm>
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        <PersonNm>CHARLES HORNSTEIN</PersonNm>
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        <PersonNm>PONCE HATCH</PersonNm>
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        <PersonNm>ALEXIS PEDRICK</PersonNm>
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        <PersonNm>JAMES VOELKEL</PersonNm>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>SCIENCE HISTORY INSTITUTE HAS A CONFLICT OF INTEREST POLICY WHICH IS REVIEWED ANNUALLY. EACH BOARD MEMBER, OFFICER AND KEY EMPLOYEE ARE REQUIRED TO SUBMIT ANY POTENTIAL CONFLICT TO THE AUDIT COMMITTEE WHICH REVIEWS THE CONFLICT AND THEN SENDS IT ON TO THE FULL BOARD FOR REVIEW AND APPROVAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION OF THE PRESIDENT/CEO IS REVIEWED AND APPROVED BY THE EXECUTIVE COMMITTEE AND FULL BOARD AND IS BASED ON COMPARABLE DATA FOR SIMILAR NONPROFIT ORGANIZATIONS. FORM 990, PART VI, LINE 15B (OTHER OFFICER OR KEY EMPLOYEE COMPENSATION): THE PRESIDENT DETERMINES THE COMPENSATION FOR OTHER OFFICERS AND KEY EMPLOYEES USING COMPARABLE ORGANIZATIONS' SALARIES AS A GUIDE BASED ON INFORMATION FROM A CONSULTANT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 AND ALL OTHER REQUIRED GOVERNING DOCUMENTS ARE AVAILABLE FOR REVIEW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGES 7-8, PART VII:</FormAndLineReferenceDesc>
        <ExplanationTxt>SALARIES FOR ALL EMPLOYEES OF SCIENCE HISTORY INSTITUTE AND SCIENCE HISTORY INSTITUTE SUPPORT COMPANY ARE PAID THROUGH SCIENCE HISTORY INSTITUTE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 12, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS A COMITTEE WITH OVERSIGHT OF THE AUDIT OF ITS FINANCIAL STATEMENTS. THIS HAS NOT CHANGED SINCE THE PRIOR YEAR.</ExplanationTxt>
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          <BusinessNameLine1Txt>SCIENCE HISTORY INSTITUTE SUPPORT COMPANY</BusinessNameLine1Txt>
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          <AddressLine1Txt>315 CHESTNUT STREET</AddressLine1Txt>
          <CityNm>PHILADELPHIA</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19106</ZIPCd>
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        <EIN>232909128</EIN>
        <PrimaryActivitiesTxt>RESEARCH LIBRARY AND COLLECTIONS MANAGEMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>PA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 12C, III-FI</PublicCharityStatusTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
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      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
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      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
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        <OtherOrganizationName>
          <BusinessNameLine1Txt>SUPPORT FROM SCIENCE HISTORY INSTITUTE SUPPORT COMPANY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>C</TransactionTypeTxt>
        <InvolvedAmt>4450207</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FAIR MARKET VALUE</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>SUPPORT FROM SCIENCE HISTORY INSTITUTE SUPPORT COMPANY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>M</TransactionTypeTxt>
        <MethodOfAmountDeterminationTxt>INCLUDED IN #1 ABOVE</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>SUPPORT FROM SCIENCE HISTORY INSTITUTE SUPPORT COMPANY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>N</TransactionTypeTxt>
        <MethodOfAmountDeterminationTxt>INCLUDED IN #1 ABOVE</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>SUPPORT FROM SCIENCE HISTORY INSTITUTE SUPPORT COMPANY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>O</TransactionTypeTxt>
        <MethodOfAmountDeterminationTxt>INCLUDED IN #1 ABOVE</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
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