Bing found the following results
H11D1 Vishay Semiconductor Opto Division | Isolators | DigiKey
H11D1 Datasheet(PDF) - Motorola, Inc
H11D1, H11D2, H11D3 Phototransistor Output | Vishay
H11D1 Datasheet(PDF) - Vishay Siliconix
H11D1-X007 Vishay Semiconductors | Mouser
H11D1 Lite-On | Mouser
H11D1 Lite-On Inc. | Isolators | DigiKey - Digi-Key Electronics
H11D1 Datasheet(PDF) - Fairchild Semiconductor
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