Looks like you have a many to many relationship. It's true that an order will contain many items of equipment, and a piece of equipment can be within many orders, but for 3NF that presents a problem. Instead what you have to do is build a composite key table. I haven't created the Keys etc for you, but as VERY simple exampe you'd need 3 tables along the lines of:
CREATE TABLE Equipment
(EquipmentID int IDENTITY(1,1),
EquipmentName varchar(50),
Price decimal(8,2));
CREATE TABLE ClientOrder
(OrderID int IDENTITY(1,1),
ClientID int,
OrderDate date);
--Now the composite key table
CREATE TABLE EquipmentOrder
(EquipmentOrderID int IDENTITY(1,1),
EquipmentID int,
OrderID int
/*--You could put a quantity in here if you wanted
--or, otherwise, you insert entries for each item,
--which might be repeated items*/);
GO
This means you end up with a one to many relationship between ClientOrder and EquipmentOrder (A Client Order contains many Equipment Orders) and a one to many for Equipment and EquipmentOrders (A piece of Equipment is in many Equipment Orders).
Hopefully that gets you on the right path.