**Document Title:**

This document appears to be an insurance endorsement form, specifically related to the International Business Machines Corporation (IBM). It outlines the addition of certain joint ventures and/or partnerships as additional named insureds under an existing policy.

**Key Information:**

- **Policy Number:** 89 06 923
- **Effective Date of Policy (Eff. Date of Pol.):** 5-21-79
- **Effective Date of End (Eff. Date of End):** 1-29-80
- **Agency No.:** 50-515-810
- **Additional Premium (Add'l. Premium):** $0
- **Return Premium:** $0

**Named Insured:**
- INTERNATIONAL BUSINESS MACHINES CORP.

**Endorsement Details:**
- The endorsement is issued by the company named above, which is the insurer under the policy designated above.
- It is issued to the Named Insured and forms part of said policy as of the effective date hereof, at the hour stated in the policy Declarations.

**Agreement:**
- It is agreed that the following joint ventures and/or partnerships are added to the policy as additional named insureds:
  1. MARKET STREET ASSOCIATES OF ST. LOUIS
  2. DISCOVISION ASSOCIATES
  3. SATELLITE BUSINESS SYSTEMS
- This agreement pertains only to the interests of IBM.

**Signatures:**
- JOHNSON & HIGGINS
- BG/wc 2-4-80
- Zurich Insurance Company
- American Guarantee and Liability Insurance Company

**Counter-signed:**
- Authorized Agent

**Revision:**
- U-GU-116-G REV. 11/76

**MM Number:**
- 009583

**Note:**
The document includes some handwritten notes, including a signature and a date (April 24), which may indicate when the endorsement was processed or signed.