No country uses grenades as their primary arm - rifles are the primary armament of any military.
Every country uses grenades.
Yes, hand grenades were widely used in WW1
Grenades were used to blow things up a little bit ovious that one
Grenades are used when you know where the enemy is but they don't know where you are so they make the perfect surprise.
While many countries use Teriyaki sauce in their cuisine, it was originally used in Japan. The Teriyaki sauce is primarily used for marinades and can be seen in foods like Teriyaki beef.
The purpose of the sitar is to be a musical insturment, primarily used in Eurasian countries.
You've got to give the country that uses the centime. Centime is used primarily as a one cent coin in French speaking countries.
Sesame oil is an edible vegetable oil produced from sesame seeds. The sesame seeds are primarily grown in developing countries. The seeds are then used to make the oil.
Swahili is primarily spoken in Tanzania and Kenya, as well as parts of Uganda, Rwanda, Burundi, and the Democratic Republic of Congo. It is also one of the official languages of these countries.
There are a large number of countries using the PAL system - Wikipedia has a map of the world showing which countries adopt this system for TV. See related link for more info.
many countries
Tin and explosive power that is no longer used.
They can be thrown at the target, or used to make boobytraps.