Sigtronics, Intercom System, models:

SCI-S6	Operating Instructions
SPA-400	Installation And Operating Instructions
SPA-4S	Installation Instructions
SPA-600	Installation And Operating Instructions
SPA-600N	Installation And Operating Instructions
Sport 200	Installation And Operating Instructions
Transcom II	Manual
UT-12D	Installation And Operating Instructions Manual
UT-4D	Installation And Operating Instructions Manual
UltraSound US-12D	Installation And Operating Instructions Manual
UltraSound US-LAC4	Installation And Operating Instructions Manual
UltraSound US-LAC4-A	Installation And Operating Instructions Manual