I think most pills with a TEC imprint are made by Ratiopharm, Canada. Ratiopharm acquired a company called Technilab sometime ago, and I know Ratiopharm is still using some TEC imprints.
From previous research, there are apparently a few pills marked with just TEC.
I can't help in this case since there is no unique imprint other than TEC. Your best bet is to call the company and ask for a positive ID.
Here is contact info for the company:
ratiopharm
6975 Creditview Road
Unit 5
Mississauga, ON L5N 8E9
Phone: (905) 858-9612
Toll free: 1 800 266-2584
Fax: (905) 858-9610
Toll free fax: 1 800 881-5175
Good luck and let us know what you find out. This same imprint has been posted many times on many boards. No one ever comes back to say what the pills could be. Since I see it so often, I'm thinking OTC or something similar.
I think you might have to measure it down to the finest millimeter for an ID. It's really strange, but most countries don't have unique identifiers like US pills. The same imprint can be used on different sizes, colors and/or shapes - and unscored or scored. Or even worse, no imprint at all.