| Company | Phone | Type |
| H-R Industries | (214) 301-6620 |
| Hadax Electronics | (201) 807-1155 |
| Hager International | (508) 429-7232 | ?? |
| Halcyon Communications | (916) 621-7890 | ?? |
| Halcyon Software | (408) 984-1497 | BBS (2400-N-8-1) |
| (408) 984-1499 | FAX |
| (408) 984-1464 | Voice |
| HaliFAX Group | see: The HaliFAX Group |
| Hamilton C Shell | see: Hamilton Laboratories |
| Hamilton Laboratories | makes: Hamilton C Shell |
| (508) 358-1113 | FAX |
| (508) 358-5715 | Sales and Support |
| Hammer Technologies | (508) 694-9959 |
| Hark Systems | (800) 367-4275 |
| Harris Digital Telephone | (415) 382-5000 |
| Harvard Graphics | (800) 255-5550 |
| Hauppage | 7 262 3122 | Australia |
| 49 2161 1706 | Europe |
| (516) 434-1600 |
| (800) 443-6264 |
| (516) 434-3198 | FAX |
| Hayes | see: Boca |
| (404) 441-1213 |
| (404) 441-1617 |
| (404) 449-8791 |
| (800) 241-6492 |
| (404) 446-6336 | BBS |
| (416) 283-2627 | Tech Support |
| (404) 840-9200 | Voice |
| hDC | (206) 885-5550 |
| Headland | (415) 623-7827 |
| (510) 656-0503 | BBS |
| (415) 656-0397 | FAX |
| (800) 248-1850 | Tech Support |
| (800) 553-1850 | Tech Support California |
| (415) 656-7800 | Voice |
| (800) 238-0101 | Voice |
| Headquarters Software | (510) 284-2877 |
| Headroom | see: Helix Software |
| Headstart | (800) 722-6224 |
| Helix Software | (718) 392-3735 | Voice |
| (800) 451-0551 | Voice |
| Henderson Comm Labs | (714) 788-8849 |
| Hercules | (510) 623-6030 |
| (510) 540-5553 | 1200/2400 bps |
| (510) 540-0821 | 2400/9600 bps |
| (510) 540-0749 | Tech Support |
| Hercules Computer Technology | (510) 540-6719 | 2400/9600/14400 bps |
| (510) 540-6621 | FAX |
| (800) 532-0600 | Sales |
| (510) 540-6000 | Voice |
| Hermes | see: Singer |
| Herstal Automation | (313) 548-2001 | Tech Support |
| Hewlett Packard | also: Colorado |
| (800) 475-6697 |
| Hewlett-Packard | (503) 750-4448 | BBS |
| (719) 531-4523 | BBS, Test eqpt |
| (800) 752-0900 | colour scanners |
| (208) 344-4809 | FAX |
| (415) 857-1501 | monitors ?? |
| (800) 752-0900 | monitors, printers |
| (408) 725-8900 | printers |
| (208) 323-2551 | printers Tech Support |
| (800) 752-0900 | x2087 Open Systems |
| Hewlett-Packard Disk Memory | (208) 323-3991 | FAX |
| (208) 323-6000 | Tech Support |
| Hewlett-Packard HP Direct Cat | (800) 387-3414 | Ontario/Quebec |
| (800) 387-3154 | Other Provinces |
| (416) 671-8383 | Toronto |
| (800) 538-8787 | US |
| Hewlett-Packard Net Bridges | (415) 857-1501 | FAX ?? |
| High Caliber Systems | (212) 684-5553 |
| High Color Magazine | (207) 236-6267 |
| Hijaak | see: Inset Systems |
| Hilgraeve | (313) 243-0576 |
| (313) 243-0645 | FAX |
| (800) 826-2760 | US and Canada |
| Hitachi | http://www.hitachi.com/ |
| (800) 262-1502 |
| Hitachi (Tokyo) | 81-3-3763-2494 |
| Hitachi America | (404) 242-1410 |
| (201) 573-7660 | FAX |
| (201) 573-0774 | monitors |
| (800) 448-2244 | monitors |
| (415) 244-7847 | Tech Support |
| (415) 589-8300 | Tech Support |
| (800) 283-4080 | Voice |
| Hitachi Service | (213) 537-8383 |
| Hitachi/Nissei Sangyo | (617) 890-0804 |
| (617) 237-2592 | FAX |
| Hitatchi Telecom USA | (404) 446-8820 |
| Holmes Microsystems | (800) 658-8418 |
| Holodyne | makes: client/server FAX solutions |
| (416) 363-3020 |
| Homaco | mailto:homaco@att.net |
| http://www.homaco.com |
| (888) 446-6226 | toll free |
| (773) 384-5575 | voice |
| homePhone | see: Pro CD |
| Homisco | (617) 665-1997 |
| Honeywell Bull Italia | (415) 974-4340 | printers |
| Hooleon | (800) 937-1337 | Keycaps |
| Hooper | (719) 528-8989 |
| HOT | see: House Of Technology |
| HotHaus Technologies | (604) 946-0060 |
| House of Technology | mailto:order@hot.io |
| (416) 620-7972 | FAX |
| (800) 672-4255 | Voice CANADA |
| (416) 620-7970 | Voice, OS/2 software |
| Houston Instruments | (512) 835-0900 |
| HP | (303) 350-4830 |
| HT Communications | (619) 489-0206 |
| HTI Voice Solutions | (508) 485-8400 |
| HTIL Telemanagement LTD | (800) 225-5485 |
| Hubbell | (416) 839-9108 | FAX Canada |
| (416) 839-1138 | Network hardware Canada |
| Hubbell Premise Wiring | (203) 535-8326 |
| Hughes LAN Systems | (416) 847-1098 | Canada |
| (415) 960-3738 | FAX |
| (415) 966-7300 | Voice |
| Human Genome Project | http://www.er.doe.gov/production/ober/HELSRD_top.html |
| Hummingbird Communications | (905) 470-0825 | BBS |
| (416) 470-1207 | FAX |
| (416) 470-1203 | Voice X-Windows |
| HyperAccess | see: Hilgraeve |
| Hyperception | (214) 343-8525 |
| Hyperdisk | see: Hyperware |
| Hyperkinetix | (714) 668-9234 | Builder, install scripts |
| (714) 979-2813 | FAX |
| Hypertext | http://www.w3.org/hypertext/ |
| Hyperware | (615) 864-6869 | Tech Support |
| (615) 864-6868 | Voice |
| Hyundai Electronics | (800) 544-7808 |
| (800) 234-3553 | Tech Support Canada- |